Malicious PDF — malware analysis report

Static analysis result for SHA-256 33dfcec8135988f3…

MALICIOUS

PDF

36.6 KB Created: 2020-08-21 19:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: daaedb13bc57b7f399a17ea68ab679a1 SHA-1: 4e543e009eaf7c219acd9a6af19efde6e56ef74d SHA-256: 33dfcec8135988f39f691c2b907b1ab22a4e2c264c596df595bb45258c1ba545
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 benign Shopify URLs, but one critical link directs to a known malicious redirector. This suggests the document is part of a link farm or SEO poisoning scheme designed to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=common+core+4th+grade+math+measurement+worksheets
    • http://files.stkittswatersafaris.com/uploads/1/3/1/4/131437889/ce6d5d.pdf
    • http://files.ewe-photography.com/uploads/1/3/0/7/130738903/3f0325a995472d.pdf
    • http://files.mrshansen.net/uploads/1/3/0/7/130776291/821a779b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/4977/1427/files/hanuman_chalisa_path_in_punjabi.pdf
    • https://cdn.shopify.com/s/files/1/0461/4776/4387/files/pirate_kings_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/3918421310.pdf
    • https://cdn.shopify.com/s/files/1/0431/3445/1874/files/fifalum.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/technical_drawing_with_engineering_graphics_13th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0444/2321/7318/files/anexo_14_oaci.pdf
    • https://cdn.shopify.com/s/files/1/0436/3422/9401/files/16988358074.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5435/files/86058800575.pdf
    • https://cdn.shopify.com/s/files/1/0434/0056/0805/files/40952200038.pdf
    • https://cdn.shopify.com/s/files/1/0429/3050/3846/files/28921629716.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sopituwoxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1827/2417/files/zeremuviwurofigokujumofal.pdf
    • https://cdn.shopify.com/s/files/1/0434/7808/9878/files/jarajobutozijowotor.pdf
    • https://cdn.shopify.com/s/files/1/0435/8258/7039/files/83269554229.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_off0000519f.bin
0675c7cd8dc277929db36102e3ba2a83e04702fa96c807838a164a30dff82288		 pdf-font-stream PDF embedded font (sfnt) at offset 0x519F 5472 bytes
font_01_sfnt_off00006418.bin
db2ab128086f1ab56e9eda265a6eedc82680aca38ba5ce3d34b44db38e99daba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6418 9764 bytes

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