Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c07d7d037ca5da8…

MALICIOUS

PDF

41.8 KB Created: 2020-08-07 17:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e62521453239288c5dcc681592768ce SHA-1: c7e4fc43eaa4e968b9738512ab45bd510f2f19df SHA-256: 6c07d7d037ca5da8fd170279e405d6fda9648cb887df196b7f3834faf7fceea3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded links, with the primary URL being a known malicious redirector. This suggests the document is part of a link farm or phishing campaign designed to direct users to malicious sites. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.ru/pify?keyword=hongo+aspergillus+niger+pdf
    • http://files.teacherarvie.com/uploads/1/3/0/9/130970003/9915974.pdf
    • http://files.fauxmesticgoddess.com/uploads/1/3/1/8/131856381/gevaxil.pdf
    • http://files.pedscovid19registry.com/uploads/1/3/1/4/131406749/5079103.pdf
    • http://files.covertsrustproofing.net/uploads/1/3/2/6/132681823/6772462.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7270/7990/files/63346118276.pdf
    • https://cdn.shopify.com/s/files/1/0429/6730/2303/files/aquelarre_de_muecas.pdf
    • https://cdn.shopify.com/s/files/1/0428/6598/3655/files/21821795174.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21511039237.pdf
    • https://cdn.shopify.com/s/files/1/0432/4062/0200/files/90684565511.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7880/files/52025604743.pdf
    • https://cdn.shopify.com/s/files/1/0433/5108/1118/files/giwazi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6163/1384/files/agriseta_bursary_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/3880/2073/files/pirowavug.pdf
    • https://cdn.shopify.com/s/files/1/0430/2408/9242/files/rupanevas.pdf
    • https://cdn.shopify.com/s/files/1/0433/7955/6504/files/cumulative_probability_distribution.pdf
    • https://cdn.shopify.com/s/files/1/0428/3056/1447/files/roblox_aidez_script.pdf
    • https://cdn.shopify.com/s/files/1/0432/0693/4688/files/40199329205.pdf
    • https://cdn.shopify.com/s/files/1/0436/5189/1358/files/chirped_pulse_amplification.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000659d.bin
3d07599b8eda36abae8836d949f79c80a9e470c7b793fb48ad8d27416b66d823		 pdf-font-stream PDF embedded font (sfnt) at offset 0x659D 5172 bytes
font_01_sfnt_off00007746.bin
3c59d162d05ea7a6569062864cebfe4ecb590855f9b63183299ecb4b85535338		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7746 10272 bytes

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