Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba7d9f3f037a3b1…

MALICIOUS

PDF

42.1 KB Created: 2020-08-11 23:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26df3e158a79b4bb0e726583046d9164 SHA-1: 834af72d7cf0d30a9a61c2b6516ac4146da74c8e SHA-256: 6ba7d9f3f037a3b1cf8a1861a8bbeb0e636a35f9580a347300f3fcbfcd024804
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged the document as a link farm. The ML classifier also strongly indicated maliciousness. The embedded links likely serve to direct users to malicious sites, potentially for phishing or malware distribution.

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=definition+of+communication+skills+by+different+authors+pdf
    • http://kuginokan.creativempartners.com/uploads/1/3/1/4/131455069/fd919d57.pdf
    • http://lomapufo.shineworksdetailing.com/uploads/1/3/0/8/130874429/5945360.pdf
    • http://files.barbarajtilly.com/uploads/1/3/1/3/131381428/0fcd18d20aa41.pdf
    • http://files.jbsgolf.com/uploads/1/3/0/7/130775429/131e3bc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1478/2104/files/88031526961.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lurexemip.pdf
    • https://cdn.shopify.com/s/files/1/0430/3159/3113/files/bunewobazureze.pdf
    • https://cdn.shopify.com/s/files/1/0429/7110/3395/files/nvsp._in_form_6.pdf
    • https://cdn.shopify.com/s/files/1/0431/5283/4717/files/disney_caribbean_beach_resort_map.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/56478831334.pdf
    • https://cdn.shopify.com/s/files/1/0428/4963/2415/files/ninoburi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8073/files/dujulurek.pdf
    • https://cdn.shopify.com/s/files/1/0438/3549/0461/files/xasufasogubikowovibipas.pdf
    • https://cdn.shopify.com/s/files/1/0427/9028/9574/files/22552356032.pdf
    • https://cdn.shopify.com/s/files/1/0431/9998/7873/files/laneserividoverop.pdf
    • https://cdn.shopify.com/s/files/1/0431/5987/9834/files/el_camino_del_guerrero_resumen.pdf
    • https://cdn.shopify.com/s/files/1/0431/3337/0522/files/57152581007.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_off0000658d.bin
4c4ca8dba02658d1fef84e83a06f48c9b22be91e937ad1364dd407b27132253c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x658D 5700 bytes
font_01_sfnt_off000078cb.bin
dafe99a0931a0a920211d2ca8f62fabc1578e574eda8ae8649bea06418e2302e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78CB 9864 bytes

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