Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8613bbbd290f42…

MALICIOUS

PDF

39.7 KB Created: 2020-09-05 14:39:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7eb99ac8f21ecf138c35964ca54ffeee SHA-1: 3ca1351dd1bd37ec8c6212e7cffb481de98f1464 SHA-256: bc8613bbbd290f4286d01a44eb45719e45dec228c60eecdef3cae9bbc5e92f10
128 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.club'. The document body, though partially corrupted, contains the same URL and a keyword suggesting a lure for educational content. The PDF also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The primary malicious IOC is the redirector URL, which is likely used to deliver a secondary payload.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.club/wix?keyword=basic+calculus+book+pdf+grade+11
    • https://cdn.shopify.com/s/files/1/0434/1488/0405/files/84365643317.pdf
    • https://cdn.shopify.com/s/files/1/0439/5086/6590/files/jaregopunexufatot.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6429/files/takimomugagirukalotonamid.pdf
    • https://cdn.shopify.com/s/files/1/0437/6818/4994/files/54597575758.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f92c65d7a024e6a8718f26566f71acb.pdf
    • https://static.usrfiles.com/ugd/12dc78_388693f364fb44a38b61619a8db29249.pdf
    • https://static.usrfiles.com/ugd/eb6612_92fef6428d4c469aab3e233d542eaef6.pdf
    • https://static.usrfiles.com/ugd/b8c837_586882f55bae49f7be74bbd8bae9132f.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0427/files/rafaqat_ali_khan_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/7509/9029/files/brother_ntellifax_770_Kullanm_Kla.pdf
    • https://cdn.shopify.com/s/files/1/0434/4417/5013/files/95709401431.pdf
    • https://cdn.shopify.com/s/files/1/0430/2074/6906/files/wujef.pdf
    • https://cdn.shopify.com/s/files/1/0437/3702/2615/files/10941686403.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_off00005bc5.bin
66e9c27181a57fa065a18212bb2a373e6b68e2899da6bd41267378cc5d9bafc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BC5 5628 bytes
font_01_sfnt_off00006efc.bin
96aaf7f92719957d9a3fe91ee56489888b7172246bbfdbdaead60ea59f5999bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EFC 10324 bytes

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