Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a2976e26120d19…

MALICIOUS

PDF

46.5 KB Created: 2020-08-14 22:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eafd0670280904527cd6bea184886664 SHA-1: d615ee13182208ffc90a91d9724e5f566efd420b SHA-256: 71a2976e26120d199db303f5630833db8ab53b72fe5819cb0a9813d1b45f1065
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to distribute malicious content or phish users. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

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.com/pify?keyword=body+shaming+statistics+pdf
    • http://daregot.carolgalais.com/uploads/1/3/1/8/131872225/201e3.pdf
    • http://files.holisticvieau.com/uploads/1/3/1/3/131398605/7bd4a2d9b956b07.pdf
    • http://files.berkshire-epc.co.uk/uploads/1/3/0/8/130873979/nosufokawifiv.pdf
    • http://files.jaredjaggers.com/uploads/1/3/1/4/131453111/susezotuwimut_vanela_babokejite.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/9874/3719/files/datevelizebinopalexovezo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8151/5673/files/fagafopizivezakupujejafop.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/sanufojaxisul.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/7270610014.pdf
    • https://cdn.shopify.com/s/files/1/0428/3655/7987/files/nikujitugod.pdf
    • https://cdn.shopify.com/s/files/1/0438/1766/4674/files/rulovikuwobatopi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1496/2848/files/61836980856.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/27886337026.pdf
    • https://cdn.shopify.com/s/files/1/0446/0806/1604/files/english_textbook_year_5_kssr_sjk.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23063093424.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_off0000772c.bin
88fc8615fae83ceebb097060c635d28dde74074b628b878245d6ba15ae1bdc56
pdf-font-stream PDF embedded font (sfnt) at offset 0x772C 5592 bytes
font_01_sfnt_off00008a25.bin
f5cc7f164c79239bd4496ddf6696ca060a5e54d637d2ee4f5e11492465e5973e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A25 10292 bytes