Malicious PDF — malware analysis report

Static analysis result for SHA-256 60a941a8cdd0db1b…

MALICIOUS

PDF

57.3 KB Created: 2020-11-08 09:50:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3ac7b8fd89e1d570253c49602d492dfe SHA-1: 9e256836cdfb0e0e80b771d39748c58c36f5b07a SHA-256: 60a941a8cdd0db1ba63aa4b28adbf80f312dbe5ccc15440649ee1be0214a1c83
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, masquerading as a document about trombone slide positions. These links predominantly point to external PDF files hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. One URL, https://gettraff.ru/123?keyword=trombone+slide+positions+for+beginners+pdf, is identified as a known malicious redirector, indicating a high likelihood of malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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/123?keyword=trombone+slide+positions+for+beginners+pdf In PDF document text
    • https://nutolifawivu.weebly.com/uploads/1/3/1/4/131437776/bivupetira.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/jobajelilela-fikisivonim-sujuzu-dewajozexazaju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374211/normal_5f8f966db14ab.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/kopiwu_gotatumeturi_bovejixegas_vivikow.pdfIn PDF document text
    • https://tabuxeniki.weebly.com/uploads/1/3/2/6/132682737/e44a12eea.pdfIn PDF document text
    • https://sajenaviwabawi.weebly.com/uploads/1/3/4/2/134266368/fonuno-lasigi-nipokojugorigad.pdfIn PDF document text
    • https://wesoxiworikezux.weebly.com/uploads/1/3/1/3/131380467/cd05e769.pdfIn PDF document text
    • https://valetakomo.weebly.com/uploads/1/3/4/0/134012509/derufa.pdfIn PDF document text
    • https://vezorobabuwej.weebly.com/uploads/1/3/0/9/130969079/7275326.pdfIn PDF document text
    • https://nimubawelekuf.weebly.com/uploads/1/3/4/2/134265751/jegoxigisuwufeka.pdfIn PDF document text
    • https://jobubati.weebly.com/uploads/1/3/1/4/131453688/47bc2e263da0.pdfIn PDF document text
    • https://xerukarikudi.weebly.com/uploads/1/3/4/3/134316935/5531276.pdfIn PDF document text
    • https://tololomajaju.weebly.com/uploads/1/3/4/4/134472688/2397258.pdfIn PDF document text
    • https://duzuvopewawufos.weebly.com/uploads/1/3/4/4/134491429/8785565.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/dukexajuj/recycling_numbers_1-7.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/automotive_flat_rate_manual.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_off0000a1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1C7 5240 bytes
SHA-256: 1b8fd7499d8224957cad34afd1b068be209e437adbc9408cf52ee8b6f0154e7d
font_01_sfnt_off0000b37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37C 10636 bytes
SHA-256: 070e4094a94a3ee1cc26b46a91e485672f519e7ebcdea5afbe1ca377056c22ca

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