Malicious PDF — malware analysis report

Static analysis result for SHA-256 146ed0a80f1e0d88…

MALICIOUS

PDF

45.8 KB Created: 2020-08-23 18:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27dcd3d45e824e69a46cec1ddca7ac77 SHA-1: 61aa8c414ac80507d7a46ef3a4562d65832969a1 SHA-256: 146ed0a80f1e0d8830f36a61017b64246e3bcaff7c524741b3174dbb0fe0c5da
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=osha+office+ergonomics+pdf`. Additionally, it exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content, likely for phishing or scam purposes.

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=osha+office+ergonomics+pdf
    • http://musozafiw.cottagethreads.com/uploads/1/3/0/7/130776483/sijizow_fafodepunuzej_gutujinupasa.pdf
    • http://miguratem.spokanehomeprep.com/uploads/1/3/2/6/132695517/4e7e8a04d382a6.pdf
    • http://files.aliciahitephotography.com/uploads/1/3/1/4/131438667/2562859.pdf
    • http://files.sensibleshock.com/uploads/1/3/2/7/132740479/vasesejakukek_faxej_lelikam.pdf
    • http://files.robfedson.com/uploads/1/3/2/6/132681836/jikirogaj-josebujenakuvoz-sipelibotil-doluvixe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/64406986209.pdf
    • https://cdn.shopify.com/s/files/1/0427/5296/6812/files/vutokovabanaxifanuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/8056/4392/files/10964049222.pdf
    • https://cdn.shopify.com/s/files/1/0430/7589/5450/files/40548526711.pdf
    • https://cdn.shopify.com/s/files/1/0435/6594/0904/files/kulimimosafubujile.pdf
    • https://cdn.shopify.com/s/files/1/0462/9053/4561/files/76987656254.pdf
    • https://cdn.shopify.com/s/files/1/0459/7710/8647/files/android_7_recovery_mode_no_command.pdf
    • https://cdn.shopify.com/s/files/1/0434/3509/8264/files/telatukifasadujobid.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_off000074ca.bin
ed74420383a003f642f2b46364191d58ee09f8b2e371fccc1447091297ebffc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x74CA 5564 bytes
font_01_sfnt_off00008785.bin
f8f0ea45e44da69a6306e4f3056b5d81dc3acc7dfc3083d02a772aea69b85dbb
pdf-font-stream PDF embedded font (sfnt) at offset 0x8785 10088 bytes