Malicious PDF — malware analysis report

Static analysis result for SHA-256 7664911e5fc4c2ed…

MALICIOUS

PDF

48.2 KB Created: 2020-10-03 11:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: bd5d287aae9eb9e93a66c95d014bedb8 SHA-1: 7f7b7569023f9083e530e708ce8014d70a79090d SHA-256: 7664911e5fc4c2ed2667ae77d83485ab9409d7847b6e3a7c98a8247dd9b27bd2
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and redirect to a known malicious URL. The document body, though heavily obfuscated, contains the target URL, suggesting a phishing or redirection attempt. No scripts were extracted, but the overall structure indicates a link farm designed to funnel users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://cctraff.ru/pify?keyword=turning+point+of+ww2+reddit In PDF document text
    • http://files.maryparmer.com/uploads/1/3/2/3/132302951/fea7ba90dc34.pdfIn PDF document text
    • http://files.gmproductions.org/uploads/1/3/0/7/130739480/3192099.pdfIn PDF document text
    • http://files.threeriversautomodelers.net/uploads/1/3/1/4/131411199/7939a7b4.pdfIn PDF document text
    • http://files.yachtavailability.com/uploads/1/3/1/6/131636983/jabowof.pdfIn PDF document text
    • http://tirajedu.debratidball.com/uploads/1/3/1/3/131379578/xanewupijubuju.pdfIn PDF document text
    • https://site-1036651.mozfiles.com/files/1036651/nusorideno.pdfIn PDF document text
    • https://site-1038527.mozfiles.com/files/1038527/18626855898.pdfIn PDF document text
    • https://site-1036832.mozfiles.com/files/1036832/dafusobitorosowon.pdfIn PDF document text
    • https://site-1038323.mozfiles.com/files/1038323/65349570360.pdfIn PDF document text
    • https://site-1039253.mozfiles.com/files/1039253/wawub.pdfIn PDF document text
    • http://sajonu.chsggja.org/uploads/1/3/1/4/131482993/27d3a2.pdfIn PDF document text
    • http://files.nikkicshairstudio.com/uploads/1/3/1/4/131407705/wujise-voduvewetu-doresi.pdfIn PDF document text
    • http://nased.saharasistasols.com/uploads/1/3/2/8/132814930/5135927.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/af1d0bdf-5653-4a5d-a23c-99da4606a03f/82407433972.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bfae145-e81f-46dd-a703-7177981f55f0/48879386908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66e99631-3f70-461c-a6bb-128998a70875/31701729809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9751e4d3-327e-42c9-914d-24c21ffb4387/pexegogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64e60150-a254-4bcc-9aab-2b1e5465f55c/99855762958.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DAB 4960 bytes
SHA-256: d84903fd37ca3ee5f715b934bfe7744446aa281a86c47f5ae05528aac87f49dc
font_01_sfnt_off00008ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EBB 10760 bytes
SHA-256: 5f7e66cad1ed82d2a767ac6c1c3696086a5ceac2e22dcf5c2323785f21cb7ff0

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