Malicious PDF — malware analysis report

Static analysis result for SHA-256 75dc49ef0644ad1a…

MALICIOUS

PDF

35.4 KB Created: 2020-08-13 22:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b4854b8f39944c9940fb2883f5cde68 SHA-1: c49493050ec5e3b3e1fabb0d4b2c7c90b3595450 SHA-256: 75dc49ef0644ad1a93eb22ce2c535412ad6272acb3ce47a97bc6c76e3937ae50
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to redirectors or potentially malicious domains, disguised as free music sheets. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to drive traffic to external sites. No scripts were extracted, but the sheer volume of links and the redirector heuristic point to a phishing or traffic-generation scheme.

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.cc/pify?keyword=baritone+horn+music+sheets+free
    • http://zefevawa.filamenthome.com/uploads/1/3/1/4/131406893/217e14681.pdf
    • http://dapavagu.st-christophers-nh.org/uploads/1/3/1/6/131637814/718504.pdf
    • http://files.moorehs1984.net/uploads/1/3/2/6/132681507/suwasetis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/san_luis_pass_fishing_reports.pdf
    • https://cdn.shopify.com/s/files/1/0433/4842/6910/files/65508764947.pdf
    • https://cdn.shopify.com/s/files/1/0432/8580/7269/files/76043814962.pdf
    • https://cdn.shopify.com/s/files/1/0434/3005/2005/files/67558188500.pdf
    • https://cdn.shopify.com/s/files/1/0428/6503/3383/files/work_breakdown_structure_sample.pdf
    • https://cdn.shopify.com/s/files/1/0440/2426/6917/files/msrtc_advertisement.pdf
    • https://cdn.shopify.com/s/files/1/0428/3957/2643/files/wesomugudinezibewetel.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/camino_de_santiago_frances_eroski.pdf
    • https://cdn.shopify.com/s/files/1/0432/0660/7012/files/23881968438.pdf
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/dinoxe.pdf
    • https://cdn.shopify.com/s/files/1/0436/3137/8590/files/46581750088.pdf
    • https://cdn.shopify.com/s/files/1/0439/1642/7419/files/fabal.pdf
    • https://cdn.shopify.com/s/files/1/0432/0336/2975/files/omr_answer_sheet_200_questions.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_off00004db6.bin
bddd5cfbccfa593e713301fdd64b1c3bf202f1698c2e04373b580b4995e34110		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DB6 5136 bytes
font_01_sfnt_off00005f01.bin
c19733c28bf9070ce4e60814e27e8b622838648ae9db2a7050b70169fcea07d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F01 9848 bytes

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