Malicious PDF — malware analysis report

Static analysis result for SHA-256 097f7f3b8ff69a72…

MALICIOUS

PDF

40.6 KB Created: 2020-08-10 05:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34493364f1fcb51ce1cbe4199e398b60 SHA-1: 77ffce176e6e77994a0804e83f6f396528faa651 SHA-256: 097f7f3b8ff69a7263dbee7a5f1c272d4e678782e152b354139d06880b6a62cf
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on Shopify and other domains, which is indicative of a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector, https://ttraff.cc/pify?keyword=aksara+jawa+lengkap+dengan+pasangan+dan+sandhangan+pdf, suggesting a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=aksara+jawa+lengkap+dengan+pasangan+dan+sandhangan+pdf
    • http://files.statebirdtogo.com/uploads/1/3/2/7/132710687/a1b067.pdf
    • http://files.impactk9usa.com/uploads/1/3/1/4/131453060/negasivatezaxe_lemot_sumavadipasod.pdf
    • http://files.easternconstructors.org/uploads/1/3/0/7/130776182/lepaxexovazexibu.pdf
    • http://files.vanessaainslie.com/uploads/1/3/1/4/131454692/sudupik.pdf
    • http://files.gigglesanddreamsabound.com/uploads/1/3/0/7/130739490/tuzala-rekaselug-perafed-wevutipel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/stock_market_lessons_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0430/4224/2709/files/9514746141.pdf
    • https://cdn.shopify.com/s/files/1/0435/0862/9659/files/jumux.pdf
    • https://cdn.shopify.com/s/files/1/0428/8570/9987/files/67385853175.pdf
    • https://cdn.shopify.com/s/files/1/0428/5625/1555/files/44833759160.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/99601690198.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/6735074847.pdf
    • https://cdn.shopify.com/s/files/1/0432/6352/5026/files/48280916661.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69296453687.pdf
    • https://cdn.shopify.com/s/files/1/0433/9063/2092/files/bujemopavogi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1543/0553/files/nebebarujupagujunigi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9975/8497/files/22984025360.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_off00006158.bin
ab0c9edad348d027f21487a7dfb3b20b2e801a7fc5663e8b86a3d129c1c97e4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6158 5524 bytes
font_01_sfnt_off00007437.bin
02e4cbcdd9b2d0fdcb45727234777485d227ec82d0b19c6f3a50753d1999cf6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7437 9632 bytes

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