Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fd6fc816670d4b…

MALICIOUS

PDF

39.7 KB Created: 2020-08-04 05:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c01eb041fc1bd95907cd2b6930804f47 SHA-1: c963cd3ea024268d5e3de3b2bf93a454a5f84f1f SHA-256: 73fd6fc816670d4b946a2fb7632169cdd8c66d102a0ac4456d8bdc9f846f6e07
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document's structure suggests it's part of a link farm or SEO spam campaign designed to drive traffic to potentially malicious sites or to obscure the true destination of the links.

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.com/pify?keyword=arpeggione+sonata+guitar+pdf
    • http://files.readnd.org/uploads/1/3/2/7/132740502/savejefoxevaw.pdf
    • http://files.thomashechtpiano.com/uploads/1/3/2/6/132682754/bebezilaluvaboz-kufegimilo.pdf
    • http://files.bluelotusmehndi.com/uploads/1/3/0/8/130813134/1530276.pdf
    • http://files.carloshoyt.com/uploads/1/3/1/3/131380707/xunapinefopufuburuse.pdf
    • http://nobulo.tomwellereditor.co.uk/uploads/1/3/2/7/132741555/kuribusabekiwogo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2457/9736/files/remiwurobekibew.pdf
    • https://cdn.shopify.com/s/files/1/0433/6674/4216/files/fatolipiniruroxetak.pdf
    • https://cdn.shopify.com/s/files/1/0430/0088/9507/files/canterbury_tales_general_prologue_modern_english.pdf
    • https://cdn.shopify.com/s/files/1/0430/8113/8343/files/xifezifodabufofefineki.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46946939033.pdf
    • https://cdn.shopify.com/s/files/1/0437/5409/4743/files/95005541755.pdf
    • https://cdn.shopify.com/s/files/1/0433/3928/4645/files/56553509254.pdf
    • https://cdn.shopify.com/s/files/1/0430/7759/9383/files/hurst_nclex_review.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0072/files/befexazubi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5281/0911/files/peposuwukos.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/94945690759.pdf
    • https://cdn.shopify.com/s/files/1/0435/7426/3963/files/mexixorafedifoxugaveza.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gibowutobarifokegibig.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_off00005cdb.bin
4c34c29046564d130cd6de06c4bb076ad93e87d03e4a7ceb4283d266ac565188		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CDB 5164 bytes
font_01_sfnt_off00006e7f.bin
e890289efee4b44b2cf171b5299a399ec3ac167ddcd3353d85e6d96d0b6bd1e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E7F 10488 bytes

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