Malicious PDF — malware analysis report

Static analysis result for SHA-256 165885da7f5cb00a…

MALICIOUS

PDF

43.7 KB Created: 2020-08-10 10:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07cf400116b04c67c52da898b2aec3c2 SHA-1: 116dd97f40aa92051409538e4be6a6edea563ac7 SHA-256: 165885da7f5cb00a4bfd1320d6721c8078098f80842d5c9c8ce4632b153a3ece
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a redirector to a malicious URL, indicating an attempt to lead the user to harmful content. The ML classifier strongly flagged this PDF as malicious. The presence of numerous external links, including a redirector, suggests a phishing or scam attempt disguised as academic material.

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=academic+skills+pdf
    • http://dajej.to-condo.ca/uploads/1/3/1/3/131379732/8029167.pdf
    • http://jozaweman.wellness-arch.com/uploads/1/3/1/6/131606490/bezikatetomuzo.pdf
    • http://files.tothpatricia.com/uploads/1/3/1/3/131380128/jotes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7623/0046/files/55018316267.pdf
    • https://cdn.shopify.com/s/files/1/0433/7631/2471/files/vebobisa.pdf
    • https://cdn.shopify.com/s/files/1/0437/0569/6407/files/41572146750.pdf
    • https://cdn.shopify.com/s/files/1/0427/4972/2790/files/yield_strength_of_mild_steel.pdf
    • https://cdn.shopify.com/s/files/1/0434/5354/6656/files/english_aptitude_test_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/6660/5211/files/14141927520.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/69901941500.pdf
    • https://cdn.shopify.com/s/files/1/0428/5458/0390/files/sf_cable_car_map.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/sikipipajomunozegeso.pdf
    • https://cdn.shopify.com/s/files/1/0433/5756/9176/files/rakugenotixe.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6911/files/12457734383.pdf
    • https://cdn.shopify.com/s/files/1/0437/7182/2229/files/82089761750.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_off00006df0.bin
878338ba46f4bfb9f291d73cafe642dca3daae6c230c07ee8ddba98088bff1dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF0 5256 bytes
font_01_sfnt_off00007fcd.bin
863a8b727631673fbcbce52cc8135cdc4927e52fe842af72b45bc98e2db8121f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FCD 10088 bytes