Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf51232cabdad9e…

MALICIOUS

PDF

59.0 KB Created: 2020-08-09 01:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19567ac5783e39b48f5fc85ac0163dc3 SHA-1: 85255cb850fefee8f7151ea9c585514762649e80 SHA-256: 7cf51232cabdad9e016494b66837cb413503e5311a36760d136343fd349c5089
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically a URL designed to trick users into downloading a PDF. The document body, though heavily obfuscated, contains a reference to the same malicious URL. The presence of numerous links to PDFs hosted on various domains, combined with the redirector, suggests a link farm or SEO poisoning attack aimed at distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/pify?keyword=ipl+2020+timetable+and+venue+pdf+download
    • http://files.meadowsparkapts.com/uploads/1/3/1/6/131606140/01f99e.pdf
    • http://files.midzi.org/uploads/1/3/0/7/130775354/1157920.pdf
    • http://files.sukhi.no/uploads/1/3/1/1/131164442/5461426.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/1607/5939/files/53301968125.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/xawipowezaxejezosibalitew.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/37604868145.pdf
    • https://cdn.shopify.com/s/files/1/0428/8613/5961/files/lovoruzenol.pdf
    • https://cdn.shopify.com/s/files/1/0433/6658/0382/files/moodle_iit_delhi.pdf
    • https://cdn.shopify.com/s/files/1/0435/3048/5915/files/87955453633.pdf
    • https://cdn.shopify.com/s/files/1/0432/3511/5175/files/xivorijukerewonawuvinol.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/8881083030.pdf
    • https://cdn.shopify.com/s/files/1/0432/5644/7136/files/kalender_2020_nrw.pdf
    • https://cdn.shopify.com/s/files/1/0430/2657/9610/files/dofavuwowinenukimow.pdf
    • https://cdn.shopify.com/s/files/1/0431/9186/1410/files/gofavavisusubipegapexaxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7513/2821/files/32105301941.pdf
    • https://cdn.shopify.com/s/files/1/0433/2666/8952/files/73655881497.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_off0000a97a.bin
1f55f461f450b5c4aceccb9af0b35d39befe1f67fd863e78d91845074a5f10b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA97A 5416 bytes
font_01_sfnt_off0000bbeb.bin
e5ccfe03e5f4167c95d8e07b308a927e21c63b2ad959c52ab43eb774979d95c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBEB 10136 bytes

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