Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc797acc37e23b7…

MALICIOUS

PDF

75.1 KB Created: 2020-10-23 06:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-28
MD5: e7be00aefcec12cf7936dbdba58309d7 SHA-1: cd8a92611fa2ce55a2cb09cb052302baf9ea5a93 SHA-256: dbc797acc37e23b73c077fb568aee53a838400a8996a3dec5b0db48fcaacd4bf
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded links, with a critical heuristic firing indicating it is a malicious redirector. One prominent URL, https://ttraff.com/123?keyword=..., appears to be a primary redirection point. The file's structure and numerous links suggest it functions as a link farm designed to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/123?keyword=%25D8%25AA%25D8%25AD%25D9%2585%25D9%258A%25D9%2584+%25D9%2583%25D8%25AA%25D8%25A7%25D8%25A8+%25D9%2586%25D8%25B8%25D8%25B1%25D9%258A%25D8%25A9+%25D8%25A7%25D9%2584%25D9%2581%25D8%25B3%25D8%25AA%25D9%2582+pdf+%25D8%25A7%25D9%2584%25D9%258A%25D9%2583+%25D9%2583%25D8%25AA%25D8%25A7%25D8%25A8%25D9%258A In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374696/normal_5f91797c7663d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370778/normal_5f88955ccd8bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369333/normal_5f8ebc26bbeb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387718/normal_5f910654a5c22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365612/normal_5f8730780df85.pdfIn PDF document text
    • https://xumogimunosu.weebly.com/uploads/1/3/1/6/131607683/4328a.pdfIn PDF document text
    • https://nikoxutaju.weebly.com/uploads/1/3/1/3/131378952/2340958.pdfIn PDF document text
    • https://solujokorox.weebly.com/uploads/1/3/4/1/134108712/vimuri-xedadipavidafa.pdfIn PDF document text
    • https://tatunonomufobuf.weebly.com/uploads/1/3/4/3/134355176/80b8612d517a82.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/zatasuwajam_golomadobigalib_runoje_bevoxeja.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/6556826.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc28b8a8-8089-4114-beaa-2857a7e56bd8/8461970334.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe5bb2be-de51-429b-a13e-39b304b98851/susudamefuvor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db10cb20-d0ae-4168-97dc-3484ff116382/712658292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13559b5f-bfbb-442d-a730-2c12ba42efae/tepopedifivarokifoleg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a71c3b99-3e9b-4917-854f-a1f2aebfc9d0/febenexuripini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cf93270-19d7-4c5c-9433-33853497ec6b/wenasululemojegud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d29afe21-bfe5-4db5-a8b2-033cf29707bf/36426905984.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d7d1e36-4f18-447b-8711-7915ae8e0e40/4601134119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/284d2789-36e0-40b4-8c76-c63ca1d24b6c/76252534125.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6407466-60d6-4bdf-af9b-ff38e0a1c62e/54962052419.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c19126cf-5123-464a-83f9-2722f44f3f68/kazumasumixilu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000e27d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE27D 32048 bytes
SHA-256: 4ef4a10209b43e8f905e8bd1c40de895449a04f3c2727673ed72b6d85f5f0158
font_00_sfnt_off000099c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99C6 4424 bytes
SHA-256: c89e7f5b47532febebfad1c41c24b30aa4d40befbfb464f63d9b2fc7d87ec433
font_01_sfnt_off0000a8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8ED 18772 bytes
SHA-256: 7abf2baedeb66070dd4a8f23f62deaae9f32e96f5a6fbe979df0fc6bd0df7db6
font_02_sfnt_off0000c6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E8 8308 bytes
SHA-256: a68990abe1b7146855ea84079a31c050c3368d1632fa62859c74a5c5942ab2c7

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