Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4091d7d7cba77ca…

MALICIOUS

PDF

69.9 KB Created: 2021-02-09 21:29:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4baa447fe1c4ef6c8da530ce74bd9363 SHA-1: b85c6f7f26a016fab860e8ae6aa47b5ec3ac54cc SHA-256: f4091d7d7cba77cae0c256c8046db095aef83761fd50747b0a668de2f4b31d6a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links pointing to external PDF files, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged the document as a link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to potentially harmful or misleading content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/123?utm_term=john+goodman+racing+seattle In PDF document text
    • https://cdn.sqhk.co/rivitovolu/jjJ6Ohj/ralisezilivuxubovogujinav.pdfIn PDF document text
    • https://nawexolaka.weebly.com/uploads/1/3/4/7/134704757/9e390433a1765d.pdfIn PDF document text
    • http://energierecrute-emplois.com/17004968089llljf.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/j0giid4/the_whip_tavern_facebook.pdfIn PDF document text
    • https://zedowegekinusil.weebly.com/uploads/1/3/3/9/133997302/7294264.pdfIn PDF document text
    • http://endi-itali.space/xosoti16g2n.pdfIn PDF document text
    • http://9gusevshop.space/23954057590vyb3d.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/gcjijge/cheetah_running_speed_mph.pdfIn PDF document text
    • https://basuxujazako.weebly.com/uploads/1/3/4/4/134467371/tesatat.pdfIn PDF document text
    • http://bossyonlinex.com/pov_car_driving_apk_hilea71m8.pdfIn PDF document text
    • https://paxobafu.weebly.com/uploads/1/3/4/6/134697986/0dfcd4bc2e3a6.pdfIn PDF document text
    • https://cdn.sqhk.co/wupofolizaj/jahiher/ant_simons_contract.pdfIn PDF document text
    • http://tublitalia.fun/reset_google_homesyu4h.pdfIn PDF document text
    • https://jebomifodav.weebly.com/uploads/1/3/0/8/130874614/fakip_puputosenonulat_kutanujizape.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/hc70WNJ/star_wars_jedi_challenges_multiplayer.pdfIn PDF document text
    • https://dugezuwodovapa.weebly.com/uploads/1/3/0/8/130874298/witivonirivi_sifenagor_sewafobujud_finugorozaju.pdfIn PDF document text
    • https://bukodebavuv.weebly.com/uploads/1/3/4/6/134657655/sovusew.pdfIn PDF document text
    • https://cdn.sqhk.co/bidubuwawi/jhIihe0/mebezoridunuf.pdfIn PDF document text
    • https://mitigovoponezix.weebly.com/uploads/1/3/4/3/134375948/5539660.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96C 5128 bytes
SHA-256: 6a239ec326b761a23fa5b97b84d06f96b35db55eb3edcb44e1cbcb1e8e63849e
font_01_sfnt_off0000da9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9E 9896 bytes
SHA-256: 1f2f1fdc9e7fd73efd3b79de50c1ab22beb90733cc557e55e14444d6d7731092
font_02_sfnt_off0000fc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2