Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b3ae8f31d739a9…

MALICIOUS

PDF

59.9 KB Created: 2020-08-11 23:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2ec81c69c38bec9743580724e0958192 SHA-1: 92b229cf90cd9c488a61121a212db54ee874e6e7 SHA-256: 81b3ae8f31d739a9b10491441c34a191fb62458a2a7c71f6d258fe813e26c125
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=beaglebone+black+wireless+schematic+pdf'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external PDFs. The document body, though heavily obfuscated, contains the same redirector URL, suggesting an attempt to disguise malicious links as legitimate content. The ML classifier strongly supports the malicious verdict.

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=beaglebone+black+wireless+schematic+pdf In PDF document text
    • http://files.rflvfd.org/uploads/1/3/1/8/131856306/popowotajug.pdfIn PDF document text
    • http://files.sihanyang.com/uploads/1/3/1/1/131164402/gerilak-fuvexovozidaxi.pdfIn PDF document text
    • http://files.budavet.net/uploads/1/3/1/6/131636678/jixufirin-vatejiwor.pdfIn PDF document text
    • http://jumujux.rachelloganillustration.com/uploads/1/3/1/0/131070420/vunuperorujiverez.pdfIn PDF document text
    • http://files.empowerdifferences.com/uploads/1/3/1/3/131381288/jiwukizakebadimepo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5731/4977/files/cours_orthographe_cm2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7270/7990/files/manufacturing_case_study_examples.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/24124250991.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3631/9639/files/biography_books.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8344/0036/files/dawogavagidax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9938/2170/files/69464532477.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3066/7673/files/86748046308.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0444/2397/0983/files/abakada_booklet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5218/7298/files/activity_diagram_for_online_food_ordering_system.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9322/1783/files/rugomuwogab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/72870089826.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA16F 5916 bytes
SHA-256: 6a56f4bb78950dc4d75eaef12459a475c1345100d4c932693ce93115306a8270
font_01_sfnt_off0000b56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56F 13900 bytes
SHA-256: fce4687f2f74358c6eb15ee8773c8f0a2e77b492f03170fe37f8f1a62fa4f028

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