Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c83cc54b073d8a5…

MALICIOUS

PDF

40.1 KB Created: 2020-09-03 06:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43f97067d764e40fb6b5f7e45795788d SHA-1: 6245ee1126a7ad68dc75173179130bc6118fa0a6 SHA-256: 4c83cc54b073d8a5a68aed624045d0fdc28eb9aa54fbb60c5157eb070b32db02
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF file contains a large number of embedded links, many of which point to domains associated with SEO link farms. One critical heuristic firing indicates a direct link to a known malicious redirector infrastructure at `ttraff.club`. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of numerous benign-looking PDF links on Shopify domains suggests an attempt to blend malicious links with legitimate-looking content to evade detection.

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=acog+guidelines+asymptomatic+bacteriuria+pregnancy
    • https://static.usrfiles.com/ugd/d01287_aded6e325db94dfebfa23e16406bf03a.pdf
    • https://static.usrfiles.com/ugd/f0b6b3_1f82107c62c94d9da894d0cef4dc841c.pdf
    • https://static.usrfiles.com/ugd/485053_0bc3674c3339415fb427fc996a78c592.pdf
    • https://static.usrfiles.com/ugd/b1b16e_a7bc74db2ed94c58b9fb37d53951579b.pdf
    • https://cdn.shopify.com/s/files/1/0430/8166/2613/files/fuxogawinegavawifozifamov.pdf
    • https://cdn.shopify.com/s/files/1/0432/1679/7857/files/application_server_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0429/2804/6233/files/sixasip.pdf
    • https://cdn.shopify.com/s/files/1/0435/7763/9075/files/mesedes.pdf
    • https://cdn.shopify.com/s/files/1/0439/4074/1275/files/tipobas.pdf
    • https://cdn.shopify.com/s/files/1/0450/1677/6868/files/al_madina_quran.pdf
    • https://cdn.shopify.com/s/files/1/0451/2677/9034/files/table_de_la_loi_binomiale.pdf
    • https://cdn.shopify.com/s/files/1/0428/5782/4419/files/rojizolapevevigikidirekim.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_off00005eaf.bin
351a97cb2733c315db21037c3899981d70077ab0d91a7c92cc55cf337a6689c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EAF 5624 bytes
font_01_sfnt_off000071bb.bin
5a9d3fc99936ba08b9cd2584e882420f104ed88345b0f37b5d7ec0273cb12671		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71BB 9916 bytes

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