Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de0e7ba45f63e91…

MALICIOUS

PDF

32.4 KB Created: 2020-08-08 10:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cd57a131fd8679ef9d89c029bdaa350 SHA-1: 1d72cfb677426c78c1b207bf82bc1bc9d18d7a95 SHA-256: 9de0e7ba45f63e91422ec4194e7ce94a556d32cdb89787ac1e81a4f424fb0368
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that at least one of these links, https://ttraff.ru/pify?keyword=calendrier+liga+2020+20+pdf, leads to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body contains text that appears to be a lure for search engines, further supporting the link farm attack pattern.

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=calendrier+liga+2020+20+pdf
    • http://files.peterrichardsart.com/uploads/1/3/0/7/130740492/7846137.pdf
    • http://files.letreschichairdivas.com/uploads/1/3/1/4/131453633/6844985.pdf
    • http://files.hordlegardeningclub.co.uk/uploads/1/3/1/0/131070591/3c39258465f4.pdf
    • http://files.leannsart.com/uploads/1/3/1/3/131384229/kamajavimoro.pdf
    • http://files.soundofsilver.net/uploads/1/3/1/4/131437017/gexadi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3124/8541/files/random_phrase_generator.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/tarat.pdf
    • https://cdn.shopify.com/s/files/1/0433/5586/5243/files/sotivimepivogelivorig.pdf
    • https://cdn.shopify.com/s/files/1/0427/6961/2966/files/96408742018.pdf
    • https://cdn.shopify.com/s/files/1/0430/5590/6967/files/86979633427.pdf
    • https://cdn.shopify.com/s/files/1/0433/2532/5467/files/the_addictive_personality.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2623/files/3813533829.pdf
    • https://cdn.shopify.com/s/files/1/0430/5482/5621/files/vodarasokanaredevani.pdf
    • https://cdn.shopify.com/s/files/1/0429/8443/9971/files/duvefo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vatamukizulenekop.pdf
    • https://cdn.shopify.com/s/files/1/0435/8393/0527/files/61234657446.pdf
    • https://cdn.shopify.com/s/files/1/0435/0925/2250/files/medical_laboratory_manual.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_off0000434b.bin
de423b4d45d9c15d77fa64fd0590c6560760e39f67bf0a0487505a2bd6398dcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x434B 5212 bytes
font_01_sfnt_off0000550f.bin
329799172e4b4d5f3ebbaaaa6514daa8b7d9f0653a05d649e5000c1ed96c6a5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x550F 9352 bytes

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