Malicious PDF — malware analysis report

Static analysis result for SHA-256 f933c9c3f2d89c77…

MALICIOUS

PDF

44.8 KB Created: 2020-08-30 22:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8fdca5e0605da003f23325a3bfd732ab SHA-1: 039f98a5965293f71d387497fe07fec6a5d6601f SHA-256: f933c9c3f2d89c77c816c8d2ce1a883648b2351f6bc9b82c5ee82ff784ac0b59
128 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.ru, which is disguised as a manual download for a Samsung device. The document also contains a large number of embedded links, many pointing to PDF files hosted on static.usrfiles.com and cdn.shopify.com, suggesting a link farm or SEO poisoning attempt. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/wix?keyword=samsung+gt+p5210+manual
    • https://static.usrfiles.com/ugd/b8c837_fbb6e42560cb4eeca66c1ba5b356fa2b.pdf
    • https://static.usrfiles.com/ugd/0d089b_4a07bd4cc02c41b69ae21a6e14c7f01f.pdf
    • https://static.usrfiles.com/ugd/269bb8_d6bc789236e64b44808756efb8a8d8a1.pdf
    • https://static.usrfiles.com/ugd/b8c837_3965226ac8f9493e9a7333be8078ceb5.pdf
    • https://static.usrfiles.com/ugd/60933b_4c141ea7ce2447cb9499977f7d941064.pdf
    • https://cdn.shopify.com/s/files/1/0429/3538/6275/files/togotupofa.pdf
    • https://cdn.shopify.com/s/files/1/0432/1126/0062/files/math_sequences_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/2657/0664/files/informatica_power_center.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9563/files/free_overstreet_price_guide_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/6790/0061/files/sagorubopine.pdf
    • https://cdn.shopify.com/s/files/1/0433/6828/4319/files/les_4_accords_toltques.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_off000063e3.bin
6fa0056a08941f0047412acd623af4aaadda5e0460f9a59ab5272718add6127d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63E3 5596 bytes
font_01_sfnt_off000076e6.bin
3c01823a758e95afca876b09bfd9712dac19e33c811d714b9f41359029a8fb61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76E6 15572 bytes

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