Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f18cce2a09bb85c…

MALICIOUS

PDF

58.5 KB Created: 2020-11-04 12:10:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 029c1478bb7572c03b88d51c25892d86 SHA-1: 27839b2f0d93a07577feeaf7ada82a3b26d52825 SHA-256: 4f18cce2a09bb85cee124b60dcd43b94550f4067551d3a0bdcac0d784330debc
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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=kjarr+daggers+rage In PDF document text
    • https://ganizosu.weebly.com/uploads/1/3/4/4/134434359/mitilaxekomopa-zabesademuwigu.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/xekena.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_5f8c5fa93e347.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421056/normal_5f9897cc93c0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401691/normal_5f9dcf6d08066.pdfIn PDF document text
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/2a995a4d7f07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365562/normal_5f872282a5255.pdfIn PDF document text
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/c2981cbe51e8ae0.pdfIn PDF document text
    • https://fuwurugosudopo.weebly.com/uploads/1/3/4/3/134326966/7659289.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459624/normal_5fa0d5d95160d.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/1af0bc79-f9ce-4a1d-818f-2f982b2a6350/selufamakerisevowilojipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f9ffe28-8f85-4dc8-a9dc-78cdd6ee66a0/kat_dahlia_gangsta_mp3.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_off00009acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9ACC 3840 bytes
SHA-256: 3e8fae6d7c9c0a3b14f6e8d4f4ee87f31e4c4c9c08703b96ca8058d93dbebb04
font_01_sfnt_off0000a871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA871 5008 bytes
SHA-256: d9df083bcfb73b66df77c0c837e9e6dc4b3d3f676d1556a826bb6c58606439a7
font_02_sfnt_off0000b994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB994 10388 bytes
SHA-256: cc40199b07915ffad8f22701c7ff41a4d46271e1210c95e0deeeca66b31cd7d5

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