Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f891fe37c99fcf…

MALICIOUS

PDF

41.1 KB Created: 2020-08-31 00:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81de4d5c8bae81223f969bd204311dfd SHA-1: 33fc95ea7fee3ec6b92d949eaa5cb92afd348827 SHA-256: 26f891fe37c99fcfe61fcef03e61ffdb6a1837c1be2af86115ff9262fd4e566d
120 Risk Score

Malware Insights

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

The PDF file contains a link that redirects to a malicious domain, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting it is an 'answer key' for 'the human body an orientation', likely a lure to encourage clicks. The PDF_SEO_LINK_FARM heuristic indicates the presence of numerous outbound links, suggesting a link farm or SEO poisoning tactic to drive traffic to malicious sites.

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/wix?keyword=the+human+body+an+orientation+answer+key
    • https://static.usrfiles.com/ugd/b8c837_3ca733eb7ac848cf887eb8202189f8c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_13a468482e48450dbbfc3fc476ab9681.pdf
    • https://static.usrfiles.com/ugd/33a2e4_0fdeba97b47c4ebd82c622e2019755d7.pdf
    • https://static.usrfiles.com/ugd/bf650e_84452f8a8fea4f648e1a9f3993cd5363.pdf
    • https://static.usrfiles.com/ugd/3d0627_8a143701b0544cd0966f24651892bc29.pdf
    • https://static.usrfiles.com/ugd/b8c837_c156cb0b3be843ce97a3e570bb728c2c.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0a919f6f23a4a198c7e1f6e0553bd13.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5221/files/nilogogibuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/3977/6159/files/11498714815.pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8910/files/tamurapeli.pdf
    • https://cdn.shopify.com/s/files/1/0429/5720/9766/files/dibunofafozisaxatipodazat.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1637/files/bawikelupabixizapa.pdf
    • https://cdn.shopify.com/s/files/1/0437/0412/3557/files/fivelu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2023/8503/files/90322002766.pdf
    • https://cdn.shopify.com/s/files/1/0430/8838/0061/files/kozonifavetusorof.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/
    • https://static.usrfiles.com/ugd/b8c837_c156cb0b3be843ce97a3e570b

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006270.bin
943bf743083f4f5bfd6fadb0717e01081a8dc288dbc13c8b24fa049e4cfaae4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6270 5380 bytes
font_01_sfnt_off000074a6.bin
697d82e9360c03378a51b455a8d186f956bcee60984e63cd659ebfc8b9a060cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74A6 10244 bytes

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