Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd5dfb198f1f6f4…

MALICIOUS

PDF

37.7 KB Created: 2020-08-30 14:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be5db93897e4175bdfcf91fef94dcad8 SHA-1: 00cfe57d58c15374c4830c9d88d1e1189c1077b2 SHA-256: 8fd5dfb198f1f6f4ecb7dd969294332aaeab635cbf06d00c95b97b0a7326bb44
150 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, specifically pointing to 'https://ttraff.ru/wix?keyword=stairway+to+heaven+violin+sheet+musi'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The file also exhibits characteristics of a link farm, with numerous embedded links, many of which point to Shopify and static.usrfiles.com, likely to obscure the malicious destination. The ML classifier strongly flagged this PDF as malicious.

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/wix?keyword=stairway+to+heaven+violin+sheet+musi
    • https://cdn.shopify.com/s/files/1/0438/5495/4656/files/in_west_philadelphia_born_and_raised_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/6590/9160/files/fijovigotoxotepi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8606/1480/files/ascap_performance_fees.pdf
    • https://cdn.shopify.com/s/files/1/0437/9105/7058/files/bigivigajo.pdf
    • https://cdn.shopify.com/s/files/1/0456/8478/5311/files/bharti_axa_insurance_copy.pdf
    • https://static.usrfiles.com/ugd/b8c837_a75f4e8acd8247edba4f7a442beb7b49.pdf
    • https://static.usrfiles.com/ugd/b8c837_d930e6b2695648d2b78bdbcfcb878088.pdf
    • https://static.usrfiles.com/ugd/868401_18b8704093ee4c5ab089140e7e94a3ec.pdf
    • https://static.usrfiles.com/ugd/b8c837_b7a530376ed044569bc785c75646b4e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_649517d3e2b14ba1816d4229783b3e13.pdf
    • https://static.usrfiles.com/ugd/286fb8_3db70b742e9c44de82ae78412e8d0aef.pdf
    • https://static.usrfiles.com/ugd/c20ea7_037e54ce0cb84477b722988668adff1b.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ba644e9e2d54107abc8321ef52a3a4a.pdf
    • https://static.usrfiles.com/ugd/b8c837_27f9a31da7ce463b889c2bad17b635fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_f702f7ca07b3449f80b3d98b7fa04ab3.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_off00004ded.bin
9ef0572e22b3eafed32d496b676e59838b713479d338d781919339afc78a5ce7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DED 5280 bytes
font_01_sfnt_off00005fc6.bin
5df6dccca7337f508adb5defc93bde4f20602dbe09e76ddd591e9aec68c787dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC6 12504 bytes

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