Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9d2d6c481cffad…

MALICIOUS

PDF

42.2 KB Created: 2020-10-06 15:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 30e5dcfc0b6133f192940f25ebd12770 SHA-1: 95c2a1dbc64780b332c4142ff29a9790498ced78 SHA-256: 1c9d2d6c481cffad038754d026e4c8f9421f49d9f95685f98f51038e5e1861ba
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links pointing to external PDFs hosted on disposable domains, indicating a link farm or SEO manipulation tactic. One critical heuristic firing identified a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the extensive use of external links suggests a potential distribution mechanism for further malicious content or phishing attempts.

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://ttraff.link/pify?keyword=energy+pyramid+worksheet+middle+school+pdf In PDF document text
    • https://site-1038733.mozfiles.com/files/1038733/67049182365.pdfIn PDF document text
    • https://site-1041695.mozfiles.com/files/1041695/17973868386.pdfIn PDF document text
    • https://site-1038378.mozfiles.com/files/1038378/puxogogevagowirifofozoluz.pdfIn PDF document text
    • https://site-1039203.mozfiles.com/files/1039203/bidodagedapaviridefiret.pdfIn PDF document text
    • http://files.sunkingdesigns.com/uploads/1/3/2/6/132681308/mavalepe.pdfIn PDF document text
    • http://vutusa.summitmartialartsacademy.com/uploads/1/3/1/3/131379591/lufubomen.pdfIn PDF document text
    • http://files.tmcwilliamsmusic.com/uploads/1/3/2/7/132712129/8624608.pdfIn PDF document text
    • http://lefuref.sammehta.com/uploads/1/3/2/6/132681763/pijaxalusolub.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/f7cfc1f9-95b9-4e74-a36d-21db4e6eda8f/47977302791.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e2a54b7-2f7f-4093-995e-61b670031a6f/tilunu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/1717/0854/files/audi_a6_manual_transmission_for_sale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0108/4566/files/60512202504.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/8907/8693/files/ucf_criminal_justice_ba.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_off00006568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6568 5784 bytes
SHA-256: 5ee8c3cfff1730cb4f328d833329f876ba2d3cb3d83c036d8d9a87d2699942bc
font_01_sfnt_off00007910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7910 10280 bytes
SHA-256: 33e3e52dd30f1a856fcb5ea1af8d7cedad8e4183e3e60bd82060d37b372e885d

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