Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8b4ef320687c8f…

MALICIOUS

PDF

34.9 KB Created: 2020-11-03 14:03:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: cf516b418742bc909e44061c07472a78 SHA-1: ee6043f3a039deea438e3702ea24a68439a217ec SHA-256: ed8b4ef320687c8fb75c37c6be2484f6c4f306c41d6917741c217e9f551e45f5
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are consistent with link farming or SEO manipulation tactics, likely intended to drive traffic to malicious sites.

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://gettraff.ru/strik?keyword=uphill+rush+6+unblocked+games In PDF document text
    • https://bogezozoxo.weebly.com/uploads/1/3/4/4/134479702/faaf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5f870baa16f66.pdfIn PDF document text
    • https://bulasenojagaroj.weebly.com/uploads/1/3/4/3/134357248/193041.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367923/normal_5f880d32d69d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_5f893f16c0040.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381090/normal_5f99e5a3848c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5f875ea819ce3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411682/normal_5f9816d817c13.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/5c40009e-ed76-40b9-91d8-7c6f1c91ab8b/40177061318.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/canciones_para_guitarra.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/68510975464.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/lawegiluximixov.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/5209451063.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/93776039245.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/iskcon_bhagavad_gita_download.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_off00004772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4772 5836 bytes
SHA-256: 1361ce9d77d9c458138693530cb75c14773af21bd60d241e652f9a14eb0da07e
font_01_sfnt_off00005b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B1E 10496 bytes
SHA-256: b2541453435432a5366c9136a93750ca4a630acf06cb7a064be58735f8241886

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