Malicious PDF — malware analysis report

Static analysis result for SHA-256 66837315421c3ce4…

MALICIOUS

PDF

44.5 KB Created: 2020-07-19 20:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54c55f548c62d5c8996e447b173a6371 SHA-1: 9cd15b9f30e3fff0a42432c7dcd1d3626bf0f2e0 SHA-256: 66837315421c3ce45d63ef435d052797b60a255d3d0c341527c417bd5a07f584
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, a common tactic for SEO link farms and redirecting users to malicious sites. One prominent link directs to 'ttraff.ru', identified as malicious redirector infrastructure. The ML classifier strongly indicates maliciousness, and the overall structure suggests 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.ru/wb?keyword=sears%20snowblower%20manuals
    • http://files.hunterdongardenguild.org/uploads/1/3/1/3/131380305/fapelawilodu_begixugexef_dafixofa.pdf
    • http://files.rolypolyproductions.com/uploads/1/3/0/9/130969377/e60e4686.pdf
    • http://files.controllerspages.com/uploads/1/3/0/8/130813851/841564.pdf
    • http://files.masstec.org/uploads/1/3/2/3/132303138/tatiraxeno_gupukitekezev_japawibe_zenanotozerepet.pdf
    • http://files.animalfineart.co.uk/uploads/1/3/0/9/130969965/muxeru.pdf
    • http://files.artlynchactingcoach.com/uploads/1/3/1/3/131380868/tagaxe.pdf
    • http://files.mensanapsychology.com/uploads/1/3/1/3/131398000/buzijedi_muzezo_kerewuke_fikupej.pdf
    • http://files.jenningsrn-to-bsn.com/uploads/1/3/2/7/132710669/2650436.pdf
    • http://files.pickinstick.com/uploads/1/3/1/3/131380251/c3ea1d68.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fizavezekef.files.wordpress.com/2020/07/direjed.pdf
    • https://lutomuwo.files.wordpress.com/2020/06/96057523731.pdf
    • https://jajexulobuta.files.wordpress.com/2020/06/raragukuzu.pdf
    • https://mijitesedi486084253.files.wordpress.com/2020/07/xokevifimovudabadijo.pdf
    • https://rogejema707534438.files.wordpress.com/2020/07/69489905035.pdf
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/52790064602.pdf
    • https://cdn.shopify.com/s/files/1/0432/0916/2907/files/68135444797.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/16760983465.pdf
    • https://cdn.shopify.com/s/files/1/0433/3849/8206/files/56470790330.pdf
    • https://cdn.shopify.com/s/files/1/0433/8027/7406/files/61112215647.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sopituwoxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45560821546.pdf
    • https://cdn.shopify.com/s/files/1/0429/7018/5879/files/68821879779.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_off00007220.bin
a2aa0078b73c30c336474b70d0b0478b911f90e64a2ce2806443b4d9cf847ca4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7220 4920 bytes
font_01_sfnt_off000082bf.bin
56c8fcefbe43a32ed6e692951ccbac91c618b0ca26e505b06430755fb76f495a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82BF 9868 bytes

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