Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc6d88338abe7fe…

MALICIOUS

PDF

42.0 KB Created: 2020-07-08 20:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ca419d7b268acf7e1a8cb0d8430f455 SHA-1: 583331f8e52522e48f4d5490227e7e753a830736 SHA-256: 8cc6d88338abe7feaf62aecc86c39cc4eb25c0d624fa037ee0bda0b8e7d531c1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF document contains a lure related to combining PDF files, which is a common tactic for phishing or malware delivery. It embeds numerous links, including one pointing to known malicious redirector infrastructure at 'ttraff.ru'. The ML classifier strongly indicated maliciousness, and the presence of a link farm heuristic further supports the malicious intent. The document's primary function appears to be directing users to malicious websites.

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/wb?keyword=combiner%20deux%20pdf%20sur%20mac
    • http://files.katascuba.com/uploads/1/3/1/4/131483253/5349126.pdf
    • http://files.sallysweetland.com/uploads/1/3/1/4/131438249/e377953a8cde1ef.pdf
    • http://files.clearwatermusicserves.com/uploads/1/3/0/7/130739183/6ce1fb3d15650b1.pdf
    • http://files.bullengarookadultriders.com/uploads/1/3/2/6/132681596/fomapofegaro-wopigadazodup-zevevamer-tirexilagenizo.pdf
    • http://files.kspaceonline.com/uploads/1/3/1/3/131380868/b7e90.pdf
    • http://files.trinityastrology.com/uploads/1/3/0/7/130775275/fifugogeronagefo.pdf
    • http://files.hello-baby-toys.com/uploads/1/3/1/4/131453807/4352687.pdf
    • http://files.cliftonrefugeesponsorship.co.uk/uploads/1/3/0/9/130969046/6049883.pdf
    • http://files.sciencetheearth.com/uploads/1/3/1/4/131453198/nunekezabori_fotazinipexubod_kuvadofug_kewilaz.pdf
    • http://files.morroandjasp.com/uploads/1/3/0/9/130969375/wojerodijudo.pdf
    • http://files.hightechtintplus.com/uploads/1/3/2/3/132302973/47aff28564.pdf
    • https://totanuviwot.files.wordpress.com/2020/06/46241043866.pdf
    • https://vomobudutud.files.wordpress.com/2020/07/zisagizom.pdf
    • https://gilogekef.files.wordpress.com/2020/06/62653301434.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63529720688.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mefopevepal.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26965864763.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_off00006378.bin
cf5de981ac30488f0f0a91089feddc0911dab394ec7f2e12f5efb2028f7fa41b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6378 5304 bytes
font_01_sfnt_off0000755d.bin
09e41c6ce01c447ac9c2bc6ee354bdcdba165835d69ad8e51f2cf27d29849434		 pdf-font-stream PDF embedded font (sfnt) at offset 0x755D 11504 bytes

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