Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c12e08545d8eea…

MALICIOUS

PDF

38.5 KB Created: 2020-08-08 19:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc5f707ab52889b7e789fc42393b311d SHA-1: fe61ecf4d8cac650819359b8dca9b75d8271c1f6 SHA-256: 85c12e08545d8eeae83151975ec307f04dd4e0668906145c6ef8076057918e82
152 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=revista+o+boticario+ciclo+08+2020+pdf'. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body is heavily obfuscated, but the primary attack pattern is clear: driving traffic to malicious or manipulative web content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.ru/pify?keyword=revista+o+boticario+ciclo+08+2020+pdf
    • http://files.protectmusiceducation.org/uploads/1/3/0/9/130969655/xavige.pdf
    • http://files.northbuffalopresbyterian.com/uploads/1/3/0/9/130968988/9673468.pdf
    • http://files.keepcalmandkickals.com/uploads/1/3/0/7/130776449/niviz.pdf
    • http://files.scenicroadsrv.com/uploads/1/3/0/7/130739892/4637125.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8863/files/pototepub.pdf
    • https://cdn.shopify.com/s/files/1/0437/3849/7185/files/86336105702.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nemopijudesukofareran.pdf
    • https://cdn.shopify.com/s/files/1/0429/3882/6918/files/torobudimo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4759/8742/files/nusutegikesoviju.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/43120876262.pdf
    • https://cdn.shopify.com/s/files/1/0432/3128/1312/files/rolaxapodireto.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6681/files/simekixonirene.pdf
    • https://cdn.shopify.com/s/files/1/0439/3598/9915/files/27546400238.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4977/files/80562590818.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46676539889.pdf
    • https://cdn.shopify.com/s/files/1/0429/6497/5765/files/45788057815.pdf
    • https://cdn.shopify.com/s/files/1/0435/4854/1087/files/thirty_useful_unix_commands.pdf
    • https://cdn.shopify.com/s/files/1/0434/5249/8070/files/14202407689.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vejumilaro.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_off0000567c.bin
5fc7d4c4eee22a58cb0f9cc933aacfca9d099a436d0e759141819f60f87e1fba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x567C 5824 bytes
font_01_sfnt_off00006a63.bin
1e82e379e13c6241c1f2b8d257dcda5ca3027c5bac4ccfdffde4ba9ce4164c64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A63 10020 bytes

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