Malicious PDF — malware analysis report

Static analysis result for SHA-256 128bab9192436cde…

MALICIOUS

PDF

36.9 KB Created: 2020-10-27 09:54:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: fd4d2355021ffa8d84372c02b02b8cab SHA-1: e35b3db5dca51260d127e0b95dde51af40ced657 SHA-256: 128bab9192436cde33355352486af9c436a635dc65813df6110a6bc1a982cbc6
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with a critical heuristic firing indicating it's a malicious redirector and part of an SEO link farm. The primary redirector URL is https://gettraff.ru/123?keyword=tony+trujillo+deck, which is likely used to funnel victims to malicious content or phishing pages. The document body, though heavily obfuscated, also contains this URL and other links, reinforcing the malicious intent.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://gettraff.ru/123?keyword=tony+trujillo+deck In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367642/normal_5f9072664b823.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375909/normal_5f92aa245d333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378613/normal_5f90074b5b0cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369152/normal_5f89f918c53e8.pdfIn PDF document text
    • https://rozazokosu.weebly.com/uploads/1/3/0/8/130813972/2fad8cc0d5548.pdfIn PDF document text
    • https://liwobolavus.weebly.com/uploads/1/3/4/1/134131542/348f0085.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_5f8ab406814d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391599/normal_5f9663095de21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369802/normal_5f8c64a21907f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5f870822b33b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370985/normal_5f9275ef9a4f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382004/normal_5f8de8178739d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405895/normal_5f968ec665bbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_5f89d353ef769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369505/normal_5f89cf37d5bc0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fodose/tactics_for_listening_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/7207419613.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5affc3c3-a3ae-4de7-96c8-19aa54181008/dapezeketeduvupowosipoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09d3c6a3-d37f-4fc1-acbd-c736a879f487/gipujavezefuz.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000052e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52E8 4736 bytes
SHA-256: 8a8b1736216dd1243a515e88493f76d67997d1e88ec0a344dc8a0a89c49eb40a
font_01_sfnt_off0000631e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x631E 10504 bytes
SHA-256: 3338b5a02879993699b90c98441fc3d1301eb43fdff98ab4d90c51fdd398f12d