Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1c81ab7c9b5c23…

MALICIOUS

PDF

35.6 KB Created: 2020-10-31 10:58:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ee1b94ba5cdb9dbc340288776abbd54 SHA-1: ee3b19d7b729efa474235af5ea1a666b5058915b SHA-256: 4d1c81ab7c9b5c23562bae4d1c2bd2ed29a104432edc40c043d61c8625952043
154 Risk Score

Malware Insights

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

This PDF document contains a link farm, with multiple embedded URLs pointing to other PDF files, and a primary link to a known malicious redirector. The document body text, though partially obfuscated, includes keywords related to 'Wyndham bentley brook hancock massachusetts' and the URL https://ttraff.club/123?keyword=wyndham+bentley+brook+hancock+massachusetts, suggesting a lure for phishing or a scam. The ML classifier strongly flagged this PDF as malicious.

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.club/123?keyword=wyndham+bentley+brook+hancock+massachusetts
    • https://cdn-cms.f-static.net/uploads/4385417/normal_5f8cbd122391b.pdf
    • https://cdn-cms.f-static.net/uploads/4374699/normal_5f9ce27e98f66.pdf
    • https://cdn-cms.f-static.net/uploads/4366309/normal_5f918229cff61.pdf
    • https://cdn-cms.f-static.net/uploads/4420434/normal_5f96da82876f6.pdf
    • https://cdn-cms.f-static.net/uploads/4415935/normal_5f97ca5d5d024.pdf
    • https://cdn-cms.f-static.net/uploads/4366308/normal_5f9bb3907e2f4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b73fa8b6-4971-4af8-800b-6288ff86603d/90691238334.pdf
    • https://cdn.shopify.com/s/files/1/0503/5465/1294/files/ur_mum_gay.pdf
    • https://uploads.strikinglycdn.com/files/a5da6e8e-5b83-40b1-b77b-4aef70fbfdc5/hp_officejet_j5780_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0500/9745/5295/files/tebugewibekopigogaxe.pdf
    • https://s3.amazonaws.com/guvovigo/scrap_metal_2020.pdf
    • https://uploads.strikinglycdn.com/files/94485f6c-603a-4e15-8dd4-1fe23b00f078/51926438450.pdf
    • https://uploads.strikinglycdn.com/files/f91dcf72-3a06-495a-b18c-d05a825583c1/patanjali_yoga_sutra_in_hindi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c63.bin
d2d7bd3a7e61190b9c24226539c9325d1b5036288d6c53a42703326ebdbaa100
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C63 5496 bytes
font_01_sfnt_off00005efa.bin
0a889aa5aeccb4ded340e1a9405f596a02ba6ee87d942741704d43b5da3368a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFA 10284 bytes