Malicious PDF — malware analysis report

Static analysis result for SHA-256 83975e887b2633e0…

MALICIOUS

PDF

48.5 KB Created: 2020-07-14 05:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2df8149bf41fbe500e10df30cb8356d SHA-1: 664175884c5b23caa98c4aeefb3afbac839f7d6c SHA-256: 83975e887b2633e0d0fa91d56667343d437d5f88d443f4f2c8d4f6686a1c1704
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 external PDF files, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. No scripts were extracted, but the presence of numerous external links and the malicious redirector strongly indicate a phishing or redirection attempt.

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/wb?keyword=hand%20wrist%20exercises%20pdf
    • http://files.wordorg.net/uploads/1/3/1/4/131453984/wozakomif.pdf
    • http://files.elegantmind.org/uploads/1/3/1/1/131164476/pitukazupakuf-vabevat-zumiriwef.pdf
    • http://files.widuskorea.com/uploads/1/3/1/4/131452804/lajez-bodab-pobibatirim.pdf
    • http://files.johnstotalentertainment.com/uploads/1/3/1/4/131437291/loruvojimejuz.pdf
    • http://files.solcriations.com/uploads/1/3/0/7/130739686/pefolowowuludimajope.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/muxajuvorupi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/8128296882.pdf
    • https://cdn.shopify.com/s/files/1/0434/3355/8168/files/fekasi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3584/files/74983394409.pdf
    • https://lagasig.files.wordpress.com/2020/06/sikexiwevaxitor.pdf
    • https://dejujegap.files.wordpress.com/2020/07/3696538166.pdf
    • https://marobafemixu.files.wordpress.com/2020/06/44780293479.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/52421594900.pdf
    • https://cdn.shopify.com/s/files/1/0431/5955/2155/files/sepokivenasuxuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/2862/8124/files/mubonepozikebofil.pdf
    • https://cdn.shopify.com/s/files/1/0431/0843/4077/files/zetudukesifowelegonap.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bararilisubolubudikolumo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0537/7688/files/46973397606.pdf
    • https://cdn.shopify.com/s/files/1/0432/8059/7152/files/nimijaxizepasa.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_off000080bd.bin
4487d519e5d005ce912e016988f7462368fca38b51dfa25cd25b7254f21d983c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80BD 4916 bytes
font_01_sfnt_off0000918b.bin
05a578608f6618806eb03e43991054f09aa23eb34aa530aa6e3be09e6a36c30a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x918B 10276 bytes

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