Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe108a5e16914d1…

MALICIOUS

PDF

40.6 KB Created: 2020-08-02 20:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31b0e7dd280bda4b579fbadb5dd1f914 SHA-1: ac3d54cdec70816055c05bec093fe7c68ef107cf SHA-256: 5fe108a5e16914d119f3db8ee1d7bd0f16b124290d67463a7aa0ea533a53e462
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains a mass external link farm, with the primary link directing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wb?keyword=fixed%20asset%20register%20pdf', suggesting a lure to disguise the malicious redirection. The ML classifier also strongly indicated maliciousness.

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/wb?keyword=fixed%20asset%20register%20pdf
    • http://files.falsefloorcreative.com/uploads/1/3/2/6/132683140/vagusawo.pdf
    • http://files.davefortuneserigraphy.com/uploads/1/3/1/4/131407435/zaxuxadisivuvo.pdf
    • http://files.saradps.com/uploads/1/3/1/6/131606348/zovilerotudezinula.pdf
    • http://files.thompsonzing.com/uploads/1/3/1/1/131163634/4085884.pdf
    • http://files.bearsgardencenter.com/uploads/1/3/1/3/131378952/kemofugiket.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tulajemo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8914/files/dudikowogive.pdf
    • https://cdn.shopify.com/s/files/1/0430/9316/4181/files/sedewudetojogakagoxaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/8497/2183/files/73031600019.pdf
    • https://cdn.shopify.com/s/files/1/0439/1396/9819/files/203256303.pdf
    • https://cdn.shopify.com/s/files/1/0432/5982/2243/files/wedoluzemulotafixudanaja.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5224/files/vepuzodib.pdf
    • https://cdn.shopify.com/s/files/1/0439/1793/4747/files/atkins_chemical_principles_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/9029/7503/files/rivojovewogigotajitiseno.pdf
    • https://cdn.shopify.com/s/files/1/0433/8873/1543/files/bissell_proheat_2x_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/6660/5211/files/35425725331.pdf
    • https://cdn.shopify.com/s/files/1/0430/9634/2695/files/26904650192.pdf
    • https://cdn.shopify.com/s/files/1/0432/7813/9556/files/ximebapaxetakodegil.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_off00005fb8.bin
df69ddc4875deac7789bdb594dfaddfa269b905ca3f6c9e9dcc345ab4fcc1266		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB8 5200 bytes
font_01_sfnt_off00007186.bin
1b827030c5ef7ad247b61045d2cd7066bb53473fe370c9ee38d36751d6159fbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7186 10608 bytes

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