Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c6b8f8856fc570c…

MALICIOUS

PDF

49.8 KB Created: 2020-08-29 19:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 446c23fbfd6a2708d9d145a9112882ff SHA-1: 4f73973cd1416b4e147ddd0f0981e647e3377ac1 SHA-256: 8c6b8f8856fc570cc329b825a78c97b740fd3f3b7e4686d4593e9b9c32b3bf74
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=kpss+%25C3%25B6nlisans+matematik+soru+bankas%25C4%25B1+indir+pdf'. This URL is likely used to deliver a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, contains the same suspicious URL, reinforcing its role in the attack. The presence of numerous other PDF links, many benign, suggests a link farm or SEO poisoning tactic to mask the malicious redirect.

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.cc/wix?keyword=kpss+%25C3%25B6nlisans+matematik+soru+bankas%25C4%25B1+indir+pdf
    • https://cdn.shopify.com/s/files/1/0434/6865/2697/files/geometric_sequence_word_problems.pdf
    • https://cdn.shopify.com/s/files/1/0428/7548/6367/files/heat_stroke_nhs_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0428/8220/3811/files/23846398771.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6917/files/20320244160.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f3280a7840346168bfa1539943b65ec.pdf
    • https://static.usrfiles.com/ugd/b8c837_94873d6420b6408291bef7a9084a226b.pdf
    • https://static.usrfiles.com/ugd/b8c837_976822f605494c2280f25cbafcfbd61d.pdf
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/44885675751.pdf
    • https://cdn.shopify.com/s/files/1/0432/6536/0034/files/bearshare_mobile_app.pdf
    • https://cdn.shopify.com/s/files/1/0430/4309/4677/files/pejurit.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b91d50b68614c46803039793415de73.pdf
    • https://static.usrfiles.com/ugd/b8c837_c91a8d6cd1764ee89fb98ba89efd4be0.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd0e606da71a4719a4b2f28e19449558.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed579ad385854d5c88d434ac03084648.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c4c.bin
048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C4C 6744 bytes
font_01_sfnt_off00005d31.bin
8db97253032126fe87d3097f1c28399aadd7e31031b024ebd5cb619641f36a9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D31 5532 bytes
font_02_sfnt_off00006f91.bin
c6602f28c3fea6b9c24aebef1eb09b79e3c58a4ed1ecd77063e4181eccad0414
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F91 3436 bytes
font_03_sfnt_off00007da1.bin
0f2bd466a6e693e7de8a1f7883213e44a1e5c315b329fa28c6cddf09c5719c9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA1 11748 bytes
font_04_sfnt_off0000a1fa.bin
d8a1a34de14a7b8fce5e51635835121d353d188f9ac9ce1e11538509fd4c5cdc
pdf-font-stream PDF embedded font (sfnt) at offset 0xA1FA 16060 bytes