Malicious PDF — malware analysis report

Static analysis result for SHA-256 428f5c767a14c0d9…

MALICIOUS

PDF

43.4 KB Created: 2020-08-14 03:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c255e5a263fbf4424f8575aef6cac84 SHA-1: 5a48f5ae35080d2bbf98b05b3475aa18ac8a1430 SHA-256: 428f5c767a14c0d9b9df5a2d9408b85dbdb0bf887019d0a3258f24b8840b1096
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on 'cdn.shopify.com'. The document body, though heavily obfuscated, contains the same redirector URL and a benign-looking PDF filename, suggesting a lure to a malicious site. No scripts were extracted, and the primary malicious activity appears to be redirection.

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.com/pify?keyword=corrugated+cardboard+sheets+nz
    • http://files.samikahn.com/uploads/1/3/1/4/131453464/1d665d367993e37.pdf
    • http://mepiw.takeaway.com.sg/uploads/1/3/1/4/131453278/4719602.pdf
    • http://gomapu.fittrainforhealth.com/uploads/1/3/1/3/131384635/551520.pdf
    • https://cdn.shopify.com/s/files/1/0433/1402/0507/files/wuvinetelunefuka.pdf
    • https://cdn.shopify.com/s/files/1/0433/1700/2405/files/hiv_aids_awareness_information.pdf
    • https://cdn.shopify.com/s/files/1/0427/5470/3526/files/97789399809.pdf
    • https://cdn.shopify.com/s/files/1/0431/8704/4510/files/34433466203.pdf
    • https://cdn.shopify.com/s/files/1/0436/2164/6498/files/sinuvazixagerijijoxepo.pdf
    • https://cdn.shopify.com/s/files/1/0447/4172/2261/files/bookkeeping_definition.pdf
    • https://cdn.shopify.com/s/files/1/0435/3405/7621/files/logiluvejuvemafemosi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2391/7478/files/sewalux.pdf
    • https://cdn.shopify.com/s/files/1/0437/2201/4870/files/dazewupetenujuvugukez.pdf
    • https://cdn.shopify.com/s/files/1/0447/3470/9914/files/75926510065.pdf
    • https://cdn.shopify.com/s/files/1/0432/0110/1985/files/wavabeselimoviwonomeb.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_off00005be9.bin
5fea45e482600fc95417d39a14ef107f34f3d0abc27626888ca7fe1851148afe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BE9 5264 bytes
font_01_sfnt_off00006dc7.bin
48cce45bd4eb5c5aa206a527be1a62126bbbe77b7850df781e773cb888ae6d41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC7 15624 bytes

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