Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf802c7c861e767…

MALICIOUS

PDF

58.4 KB Created: 2020-08-05 06:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4154e785a17185445d02dbe8c1aa6a7 SHA-1: b2a79a73b60157fc2d43a421aef329c30685f226 SHA-256: 7cf802c7c861e7671a9d8abf026e5021f572fa911bb9db5219cf0eb1221bd35c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with a critical heuristic identifying a link to a known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=calendrier+2020+octobre+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of 18 external PDF links, many hosted on Shopify, indicates a link farm strategy, likely to improve SEO for malicious content or to distribute further payloads. The ML classifier strongly flagged this PDF as malicious.

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=calendrier+2020+octobre+pdf
    • http://files.stephaniebershyoga.com/uploads/1/3/1/3/131379371/1049198.pdf
    • http://files.sacredheartepri.com/uploads/1/3/1/0/131069899/dodixafefuroremar.pdf
    • http://files.joplatesnweights.com/uploads/1/3/1/0/131071043/5498754.pdf
    • http://files.moorereplacements.net/uploads/1/3/1/4/131453485/792931.pdf
    • http://files.nmtiasf.com/uploads/1/3/1/4/131407051/xetomekukuw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3459/0878/files/11669397959.pdf
    • https://cdn.shopify.com/s/files/1/0434/3257/5132/files/godegoluxibadoxeluzi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7197/9172/files/angular_5_tutorial_point.pdf
    • https://cdn.shopify.com/s/files/1/0437/1241/3851/files/79366049918.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3755/files/fenuzuregifelajoporep.pdf
    • https://cdn.shopify.com/s/files/1/0435/9972/4702/files/zizozurasegemajikado.pdf
    • https://cdn.shopify.com/s/files/1/0433/7837/6867/files/50338886450.pdf
    • https://cdn.shopify.com/s/files/1/0431/3425/5258/files/data_mining_tutorialspoint.pdf
    • https://cdn.shopify.com/s/files/1/0428/5582/5567/files/40777232412.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/zutijofutudujig.pdf
    • https://cdn.shopify.com/s/files/1/0428/6208/4262/files/wekelanuzu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0668/1497/files/43466299687.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8714/files/fumelilotoniredumenibo.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_off0000a2da.bin
fafa9df71250eab1e7925cdfc4b07611374a3bef7ce0d61ed4f240483564e1e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2DA 5288 bytes
font_01_sfnt_off0000b4d6.bin
accd1194c90a0dbd58ae63ec8d0aa2ade0070999dbeb4cbbfba4914ca04d0a1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D6 12128 bytes

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