Malicious PDF — malware analysis report

Static analysis result for SHA-256 982f3e41d8c29dd8…

MALICIOUS

PDF

44.0 KB Created: 2020-08-11 13:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ded6a85be0f4954ed78745d4c7043434 SHA-1: 80b8836018dec7d861e9a223f3855bc50c63521a SHA-256: 982f3e41d8c29dd821f8d1c68968f621d049d3b587c51b6093746ce09169f5fa
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious by an ML classifier and contains a critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic, indicating it points to known malicious infrastructure. Additionally, a PDF_SEO_LINK_FARM heuristic fired, revealing a large number of external links, many hosted on Shopify, likely to obscure the true destination or for SEO manipulation. The document body contains garbled text but includes the URL 'https://ttraff.ru/pify?keyword=calibres+de+ptr+pdf', which is also listed as a malicious redirector.

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/pify?keyword=calibres+de+ptr+pdf
    • http://files.paterpaulus.us/uploads/1/3/1/3/131383982/tawuzejuz.pdf
    • http://jigiweju.newmontrocksretail.com/uploads/1/3/0/9/130969352/202727.pdf
    • http://files.ps27fr.org/uploads/1/3/2/6/132681556/kadem.pdf
    • http://jutenak.carpediem191.com/uploads/1/3/1/3/131398294/pafamiz_tomukig.pdf
    • https://cdn.shopify.com/s/files/1/0435/9792/2461/files/44881327495.pdf
    • https://cdn.shopify.com/s/files/1/0434/0691/7799/files/vojosa.pdf
    • https://cdn.shopify.com/s/files/1/0432/3550/8387/files/esl_games_for_young_learners.pdf
    • https://cdn.shopify.com/s/files/1/0437/4393/6673/files/96848664591.pdf
    • https://cdn.shopify.com/s/files/1/0435/8022/7747/files/49755126085.pdf
    • https://cdn.shopify.com/s/files/1/0433/9728/3992/files/sql_interview_questions_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/0154/3831/files/unable_to_access_jarfile_server._jar.pdf
    • https://cdn.shopify.com/s/files/1/0430/1442/2687/files/38720377462.pdf
    • https://cdn.shopify.com/s/files/1/0433/1149/7366/files/9605734677.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4434/files/56644121572.pdf
    • https://cdn.shopify.com/s/files/1/0430/0826/2297/files/shimano_deore_lx_schaltung_einstellen_anleitung.pdf
    • https://cdn.shopify.com/s/files/1/0438/3421/2509/files/29879444392.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064ba.bin
9bb1440580d221ce141d582e0daecd2c75ae3e0310bfa8295ee427c310cca43a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64BA 5080 bytes
font_01_sfnt_off00007602.bin
1d0c41ac73a7f8b7c7a3ef0f87a40afd61dae62c4193849657675dfaa9ad0896		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7602 14580 bytes

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