Malicious PDF — malware analysis report

Static analysis result for SHA-256 02bf160354e0f9f4…

MALICIOUS

PDF

43.2 KB Created: 2020-08-07 23:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7725429e00f9a58ecd4b7f8109aca38a SHA-1: 7d5fc314d7fcd643871249bf34ce31697fcadfaa SHA-256: 02bf160354e0f9f4ae77ebef37384b4b366146f62e9cfe0502832db468049141
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to distribute other PDFs. One prominent link, 'https://ttraff.cc/pify?keyword=memento+mori+book+pdf', is 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 engage in SEO manipulation for malicious purposes. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links.

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=memento+mori+book+pdf
    • http://files.greenstitch.com/uploads/1/3/1/3/131384468/4676809.pdf
    • http://files.helintazelaar.nl/uploads/1/3/0/8/130814176/xuviferixatulitimu.pdf
    • http://gedumirex.minnesotauruguaypartners.org/uploads/1/3/2/3/132302978/senux-poxorawagov-kasepunubebexu-nigovuratuvebo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/0749/0717/files/kanojuvozofajaxexaz.pdf
    • https://cdn.shopify.com/s/files/1/0436/5962/4606/files/electric_boundary_conditions.pdf
    • https://cdn.shopify.com/s/files/1/0435/1007/1460/files/vavedolidodur.pdf
    • https://cdn.shopify.com/s/files/1/0431/6053/5196/files/shading_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97242885008.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/nodowunavagajafozugogisod.pdf
    • https://cdn.shopify.com/s/files/1/0430/3428/0099/files/61244692757.pdf
    • https://cdn.shopify.com/s/files/1/0451/0456/2328/files/antiacidos_en_el_embarazo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8158/0188/files/19827412770.pdf
    • https://cdn.shopify.com/s/files/1/0437/2761/8209/files/principe_de_fonctionnement_du_carburateur.pdf
    • https://cdn.shopify.com/s/files/1/0428/5821/7631/files/72085855535.pdf
    • https://cdn.shopify.com/s/files/1/0428/1283/3959/files/belisizir.pdf
    • https://cdn.shopify.com/s/files/1/0434/1186/5751/files/www_blackanddecker_com_newowner.pdf
    • https://cdn.shopify.com/s/files/1/0432/8580/7268/files/49463730099.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8992/files/37956136274.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_off00006cb2.bin
069693a03da9c42b923dfa319121c92c842c5182d10dabf0f5fd9e89c7882a5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CB2 4976 bytes
font_01_sfnt_off00007d94.bin
b67300ef529e29f2aaaf96c695497f6e9e0fa1ef52ecf207be7a16f536d78786		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D94 10040 bytes

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