Malicious PDF — malware analysis report

Static analysis result for SHA-256 945b31bee4d5c255…

MALICIOUS

PDF

46.9 KB Created: 2020-11-08 21:53:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 67cee0d218f3d9cbaf291df0f25f07d3 SHA-1: d3ac40ded42649d58a5f0580c7a18a58c2762301 SHA-256: 945b31bee4d5c255d210a2cd45e68d67b4c4c94fd3e9ba0a0b05757a7bb6fe37
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ML classifier strongly flagged this PDF as malicious. The primary malicious URL identified is traffset.ru, which likely serves as a redirector or landing page for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/123?keyword=crystal+chronicles+artifact+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424933/normal_5fa4e4ebd5867.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420752/normal_5fa595bb8c58a.pdfIn PDF document text
    • https://masejufubalabej.weebly.com/uploads/1/3/4/3/134388341/fd93fdd0377e.pdfIn PDF document text
    • https://fenawivo.weebly.com/uploads/1/3/4/0/134000055/3c42793.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5f8fd6eb98283.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xipavir/6611107725.pdfIn PDF document text
    • https://zokelemix.files.wordpress.com/2020/11/xuwilikag.pdfIn PDF document text
    • https://mufetamutobe.files.wordpress.com/2020/11/43039138876.pdfIn PDF document text
    • https://notazit.files.wordpress.com/2020/11/76591847690.pdfIn PDF document text
    • https://podigukili.files.wordpress.com/2020/11/wofenegegimosinalin.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/tajuji.pdfIn PDF document text
    • https://tojovaw651389336.files.wordpress.com/2020/11/fubipasikefop.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/business_plan_executive_summary_example.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000093bc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x93BC 17908 bytes
SHA-256: 3f3dccfbf16ff96907c0d72696c69a80e85c7f739bda0ff21a6f317805c2d411
font_00_sfnt_off00005f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F75 5288 bytes
SHA-256: b0dd48995f06961c3b57306e22352fdd5a56607e0749e97d07e587f4a28c594d
font_01_sfnt_off00007170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7170 9948 bytes
SHA-256: a795f20771013a4fc5ed033b56d01bc1c9042a23f27da3bc039b3065f359e36f

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