Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ffb22860b62c571…

MALICIOUS

PDF

43.3 KB Created: 2020-08-08 03:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 249ad3344b6adf94959b872ec7eb4ff6 SHA-1: 26fcbae128a17b15cbe8af1c2a7dabf9fe12df83 SHA-256: 5ffb22860b62c57129c3cc9d8236d22356e4e3365399aed906fef658c6a841cd
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, including one pointing to known malicious redirector infrastructure (ttraff.ru). The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm designed to mimic legitimate content, such as research papers. The ML classifier and critical heuristics strongly indicate malicious intent, likely for phishing or distributing further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/pify?keyword=mobile+games+addiction+research+paper+pdf
    • http://files.elkhollowgetaway.com/uploads/1/3/1/3/131380754/pobibifalalebaneb.pdf
    • http://files.bobbiluphotography.com/uploads/1/3/0/7/130738852/gadosedafod.pdf
    • http://dufaj.ccmomc.org/uploads/1/3/1/3/131379732/tenanokutet-jukumid-gimapive-fimataregixef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5430/9284/files/social_history_of_england_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0448/3710/9917/files/concepto_biodegradable.pdf
    • https://cdn.shopify.com/s/files/1/0440/0565/4678/files/35836445093.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dekafarisajanitid.pdf
    • https://cdn.shopify.com/s/files/1/0440/2275/9582/files/fallout_new_vegas_project_nevada.pdf
    • https://cdn.shopify.com/s/files/1/0428/1945/3095/files/62807594431.pdf
    • https://cdn.shopify.com/s/files/1/0437/8850/1143/files/palinuxajiresofuk.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/centroid_and_centre_of_gravity_problems.pdf
    • https://cdn.shopify.com/s/files/1/0434/8765/8141/files/cells_at_work_manga_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0434/0056/0805/files/lekizebiwo.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_off00006a11.bin
b72de281880f365b1230cd27ad2c2599a173cedf7ff87d8d0532ed264ade9d77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A11 5716 bytes
font_01_sfnt_off00007d67.bin
7301bcd9dba576939518d78e975aecf77e56705196c53d9cf6272911f3665361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D67 10360 bytes

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