Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c9f590b83d8966…

MALICIOUS

PDF

45.1 KB Created: 2020-08-30 04:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8121ecedff696a3eeb7002cab946d90 SHA-1: 512c2b271aa0d2a6ceb64fc2246172aa27be7c21 SHA-256: 21c9f590b83d8966d3d763fb707018bc163c62c2267177018fbfccf89177c9d5
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains but are likely part of a link farm to improve SEO for malicious content. One critical heuristic firing indicates a direct link to a known malicious redirector at 'https://ttraff.cc/wix?keyword=raw+artists+review'. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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.cc/wix?keyword=raw+artists+review
    • https://cdn.shopify.com/s/files/1/0431/0997/4169/files/xfinity_change_wifi_password_manually.pdf
    • https://cdn.shopify.com/s/files/1/0434/0462/4021/files/beamng_drive_free_trial_no.pdf
    • https://cdn.shopify.com/s/files/1/0432/8570/8953/files/zoxudaxikatikapol.pdf
    • https://static.usrfiles.com/ugd/b8c837_6fbe8aa1ddb442968027325f89fc08b0.pdf
    • https://static.usrfiles.com/ugd/345929_13b9f39f3f274e499e6743d06cbcddc7.pdf
    • https://static.usrfiles.com/ugd/ddb60a_21c8c0d5d4a74890bdee40f310878e68.pdf
    • https://static.usrfiles.com/ugd/7baf93_44e87a5d41d24d0bb8ee6e9ec830f301.pdf
    • https://static.usrfiles.com/ugd/b8c837_149507f2d77e4a9488cc1ef10ebe7490.pdf
    • https://cdn.shopify.com/s/files/1/0431/6764/5852/files/latest_android_mobile_phones_below_7000.pdf
    • https://cdn.shopify.com/s/files/1/0434/5187/5494/files/75634536016.pdf
    • https://cdn.shopify.com/s/files/1/0434/6370/4729/files/pidomuv.pdf
    • https://cdn.shopify.com/s/files/1/0459/6082/2943/files/91639024653.pdf
    • https://cdn.shopify.com/s/files/1/0439/9074/5246/files/wolupuwi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2340/8032/files/45192439289.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21511039237.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_off000073a4.bin
33dfe5f60247e732d6bfddca08e903ec3ff84479e9aaf2ba921c3d17004d181c
pdf-font-stream PDF embedded font (sfnt) at offset 0x73A4 4804 bytes
font_01_sfnt_off0000842a.bin
0afc669511d1e57be2384d6b14eda15b6749b7f98aadca2931046cc81ed6d95b
pdf-font-stream PDF embedded font (sfnt) at offset 0x842A 10352 bytes