Malicious PDF — malware analysis report

Static analysis result for SHA-256 746f1f44ece8c176…

MALICIOUS

PDF

43.6 KB Created: 2020-11-03 06:14:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 53d3f01999f7d151bbe444e4686115f8 SHA-1: b7d32604444b3f831f80c543752da365946752b7 SHA-256: 746f1f44ece8c1768b167be663cee6de01e4a4c6d3066c4c46afffa85a69c39d
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, with heuristics indicating it's a link farm designed to redirect users to potentially malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The primary purpose appears to be traffic generation and potentially leading users to malicious content via the identified redirector.

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.
  • 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://gettraff.ru/strik?keyword=pythagorean+spiral+draw In PDF document text
    • https://nikoxutaju.weebly.com/uploads/1/3/1/3/131378952/8106763.pdfIn PDF document text
    • https://zagukosi.weebly.com/uploads/1/3/4/3/134314994/6727057.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/9d013.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375698/normal_5f8af090dc84e.pdfIn PDF document text
    • https://zafitageleg.weebly.com/uploads/1/3/4/4/134489703/815626.pdfIn PDF document text
    • https://xonuvalax.weebly.com/uploads/1/3/1/4/131437330/7694707.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c36dc49-77cc-41fd-a2b0-aa4b4cbefcf8/44884487992.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b64c4c8-0c8d-4658-a9c1-b0ca8ee0ba4c/gopuviminovujikitodugezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92b0e9e4-97c3-45e8-85a0-51a9135694d6/the_guide_to_the_future_of_medicine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/027317a6-28b1-47f1-8928-02a91e60fcbe/8833269186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2010688-4b63-4f44-978e-4f0fa298996f/65872019623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d69896b-6534-4295-a342-843440d28d9e/slam_drift_unblocked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/3994/7413/files/how_much_are_classics_illustrated_comics_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34e72f1b-0a74-44f7-abe7-c4afa3ba9724/ludupitadufofipiwejupinej.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_off00006b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B76 5416 bytes
SHA-256: 9f2d49257716d138ec0d0dceaf3465180725b9620259c39621c47b3f0bddc1c3
font_01_sfnt_off00007df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF7 10516 bytes
SHA-256: cb2498439a3ebfbbcd8283b8e104bf774e684264a4da98668a942f82d3fd5af7

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