Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5119caa3b8a85d…

MALICIOUS

PDF

45.5 KB Created: 2020-04-01 17:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 284229637b4d116a1a33a029ad2c0fff SHA-1: a04aab5ecff4972f802d488584fba8c0d3e4bb92 SHA-256: cf5119caa3b8a85de6473e49627250d3bd818abaeb8f77f88a08cb267b9bf954
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to similarly structured URLs on various domains. This behavior is indicative of a link farm or SEO poisoning tactic, designed to drive traffic to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is used for malicious redirection. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://winzelerinc.com/uploads/1/3/1/3/131398220/131398220.html#grafico+de+barras+para+2+grado
    • http://graceassemblyrichmond.ca/uploads/1/3/0/8/130874085/2549298.pdf
    • http://1113studios.net/uploads/1/3/0/9/130969399/655653bb8a87c05.pdf
    • http://littledragonsrugby.org/uploads/1/3/0/7/130775528/gewolezez.pdf
    • http://www.directactionfilm.cahabanewmedia.com/uploads/1/3/1/3/131379301/7169535.pdf
    • http://hesperianmusic.com/uploads/1/3/0/9/130968972/linaner.pdf
    • http://kathrinedawnwilliams.com/uploads/1/3/1/1/131164234/60deddc6257b.pdf
    • http://highfieldconstruction.net/uploads/1/3/0/7/130775645/kawezududosume_bamuwawovo_zexikegudan_pejiz.pdf
    • http://aclifesciences.biz/uploads/1/3/0/7/130775605/watonusadigoxek-refema-batabivoputixes.pdf
    • http://justice.moe/uploads/1/3/0/5/130543848/7423d.pdf
    • http://reednilandcorner.org/uploads/1/3/0/5/130550880/3806900.pdf
    • http://globalafricadiaspora.org/uploads/1/3/0/3/130379150/lamegi.pdf
    • http://rmadventurerentals.ca/uploads/1/3/0/6/130621836/lujadedamekixe.pdf
    • http://encounteratl.com/uploads/1/3/0/7/130740338/xokoxibewuji_xasisu.pdf
    • http://bariboots.com/uploads/1/3/0/7/130740429/6752725.pdf
    • http://cornerstonegemsinc.com/uploads/1/3/0/7/130776205/lopukujelumezux-jutepagasefig.pdf
    • http://ignoramiacapital.com/uploads/1/3/0/5/130588905/915e7acbcc25.pdf
    • http://janvoss.amsterdam/uploads/1/3/1/4/131407877/61366.pdf
    • http://rotateproxy.com/uploads/1/3/0/6/130621140/6885546.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000706c.bin
b981dcf0f628651a1ce66156fd568c8185454c11d2e6f138302e0148d9347af6
pdf-font-stream PDF embedded font (sfnt) at offset 0x706C 9224 bytes
font_01_sfnt_off00009185.bin
99c5a563bd14079918bfffdbdfd95054cabbef0c47e0e3eb61f716c3cd559389
pdf-font-stream PDF embedded font (sfnt) at offset 0x9185 16124 bytes