Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dbaf43e67516596…

MALICIOUS

PDF

39.4 KB Created: 2020-08-04 06:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f98faee0ebfdeccff9767abd99f6f31 SHA-1: e0d4a24e8d865801c5ccf7d2600571118db0c5f9 SHA-256: 6dbaf43e675165965b273ff37ff7b4a30706bf0073f2e11bee55e73e83cc5322
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external PDF files hosted on Shopify and other domains. One of the primary links directs to a known malicious redirector infrastructure, suggesting an attempt to lead users to harmful content. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this document is part of a link farm designed to distribute malware or facilitate phishing.

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=vitamina+b2+pdf
    • http://files.ghcroquetclub.com/uploads/1/3/1/4/131452817/fekolujobifogut_majulip_livozo.pdf
    • http://files.southernairehuskies.com/uploads/1/3/0/7/130740211/kekuk.pdf
    • http://files.dianakurin.com/uploads/1/3/2/7/132740997/gijexel.pdf
    • http://files.britefulbiz.com/uploads/1/3/1/6/131606175/wanet.pdf
    • http://files.itsrustic.com/uploads/1/3/1/4/131413718/sibez-judapa-bakasufiz-mowedodupunor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mudamizoxudaxusuzo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8941/2767/files/baxazosomaredajeder.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/wadagirudafejudiwofisenog.pdf
    • https://cdn.shopify.com/s/files/1/0430/3116/7137/files/91339663228.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/88075317933.pdf
    • https://cdn.shopify.com/s/files/1/0430/0649/2823/files/acta_constitutiva_sociedad_anonima_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0441/1247/8360/files/42548154705.pdf
    • https://cdn.shopify.com/s/files/1/0440/5503/6054/files/37121742286.pdf
    • https://cdn.shopify.com/s/files/1/0431/0908/9434/files/jekodox.pdf
    • https://cdn.shopify.com/s/files/1/0430/4309/4677/files/jirivofavatosukulelizifik.pdf
    • https://cdn.shopify.com/s/files/1/0441/1044/6744/files/cambodia_calendar_2020_with_holidays.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_off0000560b.bin
3ec569e232646bd226049bb56fcd0367ae4c569d14e8f26d381ab92f090ff590		 pdf-font-stream PDF embedded font (sfnt) at offset 0x560B 5116 bytes
font_01_sfnt_off0000676e.bin
ef4a5e731e872a9ca750d774a0b4d0fe2fe21db0b851c9c9be05f02c6dffb99f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x676E 13356 bytes

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