Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4d3c2390878aeb…

MALICIOUS

PDF

42.7 KB Created: 2020-10-09 12:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cd336be125902dc3dd15d05c0ea3d4f9 SHA-1: fbca75278b67f7409d8458e629bd051c102d620c SHA-256: dd4d3c2390878aeb46c5d4cbc60f46b9db9ff78a5612b1f1144b2c7baf1b0032
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that point to a known malicious redirector and a large number of other PDFs, indicative of a link farm. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to click on a malicious link, which is likely intended to lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.link/pify?keyword=haemar%2527s+shame+skyrim In PDF document text
    • https://site-1037212.mozfiles.com/files/1037212/tuzipoloriselesila.pdfIn PDF document text
    • https://site-1039576.mozfiles.com/files/1039576/duwopapibekamekolijojo.pdfIn PDF document text
    • https://site-1040248.mozfiles.com/files/1040248/78771321522.pdfIn PDF document text
    • https://site-1039210.mozfiles.com/files/1039210/dulubanugupereze.pdfIn PDF document text
    • https://site-1039733.mozfiles.com/files/1039733/sejozororugerimo.pdfIn PDF document text
    • http://rudiwo.covingtonproductions.com/uploads/1/3/2/7/132740264/3504331.pdfIn PDF document text
    • http://files.emarrocchella.com/uploads/1/3/2/7/132740649/lelap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2723/2918/files/69535290246.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6150/5955/files/metufuwuxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5901/4551/files/black_widow_costume.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8066/3705/files/40011890101.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0F 4544 bytes
SHA-256: 56c279c3ac71247da13a2c9395b14f5e3677aa1beb591b23428bea4442624a02
font_01_sfnt_off00006e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E6A 10084 bytes
SHA-256: 2c6be675c270ed9d950fc3bbbba7662ac25e6f4e106e5eccc2be91c9f2e316b9
font_02_sfnt_off00009093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9093 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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