Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4b85bd26f791f0…

MALICIOUS

PDF

44.9 KB Created: 2020-09-01 12:40:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a206be6a6d8ae017f260bb580c8e3187 SHA-1: df0cffe6346356698803a48fdab1638476d4a64f SHA-256: ce4b85bd26f791f0aa94150fd367ebf44943752049c12083d6ea5c1ff59175d8
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/wix?keyword=risperidone+drug+card+pdf', is designed to lead the user to malicious infrastructure. The PDF also contains a large number of external links, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic to distribute the malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=risperidone+drug+card+pdf
    • https://cdn.shopify.com/s/files/1/0435/1868/9432/files/active_and_passive_voice_teaching_ai.pdf
    • https://cdn.shopify.com/s/files/1/0430/0419/9075/files/thinking_maps_templates_word.pdf
    • https://cdn.shopify.com/s/files/1/0429/9970/9855/files/rexilakizanokeluvonadidip.pdf
    • https://cdn.shopify.com/s/files/1/0431/9870/9918/files/sugaso.pdf
    • https://cdn.shopify.com/s/files/1/0435/6112/4008/files/pubg_mobile_wallpaper_4k_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0430/5318/7223/files/john_wick_2_1080p.pdf
    • https://cdn.shopify.com/s/files/1/0466/2984/7205/files/43637216456.pdf
    • https://cdn.shopify.com/s/files/1/0459/1874/8823/files/pidid.pdf
    • https://cdn.shopify.com/s/files/1/0429/8165/4679/files/fazoxaradakamugejete.pdf
    • https://cdn.shopify.com/s/files/1/0440/8547/7541/files/83261368910.pdf
    • https://cdn.shopify.com/s/files/1/0433/8489/7692/files/orthographic_paper.pdf
    • https://cdn.shopify.com/s/files/1/0435/1829/6228/files/xawoganevufatugawe.pdf
    • https://static.usrfiles.com/ugd/784815_58a6b4ad9e9f44d2897952bacf9eb691.pdf
    • https://static.usrfiles.com/ugd/3f4b99_106e6affc145482babea54c98eecede9.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a92d4228df245729137bddd11933ccb.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_off00007273.bin
527b000586394636287f84f2c02a49e17943945302433acc11b153ce8708ebd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7273 5300 bytes
font_01_sfnt_off00008491.bin
377bc26a0157e5b438dbc7b4998cc459f2c443908f3e0201d03e6891827d57f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8491 9996 bytes

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