Malicious PDF — malware analysis report

Static analysis result for SHA-256 65124539a382ebeb…

MALICIOUS

PDF

49.5 KB Created: 2020-08-07 13:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11de911e612d8ab3e59de4b9d0efb94e SHA-1: 110c8760b9991ce544561e0e1fc266a3eef6e055 SHA-256: 65124539a382ebebdae974225807bea389979234f3ff663143d8c8b00d392f0e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, with one prominent link identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. The document body, though heavily obfuscated, contains the malicious URL, reinforcing the phishing or redirection intent.

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=polarity+index+of+solvents+pdf
    • http://files.godlybrandinc.com/uploads/1/3/0/8/130813448/40cf284d8df4e54.pdf
    • http://files.adrienneghaly.com/uploads/1/3/1/4/131454733/kivibikusarozi_mozixibam_gazivopekixex.pdf
    • http://lafege.kandykayscaramuzzo.com/uploads/1/3/1/8/131857334/97f2600.pdf
    • http://files.valeriesplayhouse.com/uploads/1/3/1/6/131607163/tuludiwa-dakizawilosoji-vasudaxoli.pdf
    • http://files.caligofx.net/uploads/1/3/1/3/131379692/nusuba_fisimi_niguteniseme_vowilasa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6454/0835/files/guwunafukesarumixisige.pdf
    • https://cdn.shopify.com/s/files/1/0432/5765/9547/files/75868303137.pdf
    • https://cdn.shopify.com/s/files/1/0433/1775/6062/files/vowuwutezitiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/5863/4658/files/wixoruzexutudok.pdf
    • https://cdn.shopify.com/s/files/1/0427/4687/1974/files/fipanigetorufuba.pdf
    • https://cdn.shopify.com/s/files/1/0437/7939/1646/files/73205535454.pdf
    • https://cdn.shopify.com/s/files/1/0432/1925/5454/files/cesare_beccaria_on_crime_and_punishment.pdf
    • https://cdn.shopify.com/s/files/1/0433/0107/7142/files/jamunox.pdf
    • https://cdn.shopify.com/s/files/1/0431/2327/7973/files/pelegilime.pdf
    • https://cdn.shopify.com/s/files/1/0437/5809/2439/files/79568163634.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0945/files/50836343387.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/68020883088.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_off0000777e.bin
49863bd6db2dd5404d6950213b49621533a0fcb0d677503a417743642f0da381		 pdf-font-stream PDF embedded font (sfnt) at offset 0x777E 5268 bytes
font_01_sfnt_off0000898d.bin
128390467586c633d15f5d20b3e00b16e48b5e3984f328c9739c19940ceabb0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x898D 14736 bytes

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