Malicious PDF — malware analysis report

Static analysis result for SHA-256 376b8229a349a5f4…

MALICIOUS

PDF

41.5 KB Created: 2020-08-31 06:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80fb69e2b6937b200a4b081958d32ad6 SHA-1: 18319ea4f1cbdae386e6107db9c26e3cd49c8664 SHA-256: 376b8229a349a5f49fecefd926ba5d9701bc080f4988cce9813a2006813523f0
128 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, contains text suggesting urgency, which is also flagged by a heuristic. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to distribute the malicious redirector.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.com/wix?keyword=clinical+pathophysiology+made+ridiculously+simple
    • https://cdn.shopify.com/s/files/1/0428/5490/8071/files/77010025523.pdf
    • https://cdn.shopify.com/s/files/1/0439/2937/0779/files/24737371921.pdf
    • https://cdn.shopify.com/s/files/1/0433/4908/2264/files/78275733414.pdf
    • https://cdn.shopify.com/s/files/1/0436/7518/9401/files/cerere_inmatriculare_auto_bucuresti.pdf
    • https://cdn.shopify.com/s/files/1/0432/9753/8208/files/lakafunokenaju.pdf
    • https://cdn.shopify.com/s/files/1/0434/5433/3093/files/12897895686.pdf
    • https://cdn.shopify.com/s/files/1/0430/2766/0951/files/19184675401.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3902/files/shallow_alto_sax_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/3497/6157/files/61726013518.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/abbreviations_in_computer_networks.pdf
    • https://static.usrfiles.com/ugd/b8c837_9fc0f95631f744759b2ac730f477f9fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_a76e980b1f39450f951d76a58e35e1f6.pdf
    • https://static.usrfiles.com/ugd/b8c837_3287f6c608f146e5b9d64f30e8c8d0a0.pdf
    • https://cdn.shopify.com/s/files/1/0431/9156/6493/files/japanese_text_faces.pdf
    • https://cdn.shopify.com/s/files/1/0428/6893/2767/files/93300066172.pdf
    • https://cdn.shopify.com/s/files/1/0435/8176/7841/files/beauty_and_the_beast_piano_sheet.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_off00006398.bin
4381e4ec53098e5a2cd1959f5d3a8728d131ca9fdb61c4439a1e71aef6861f2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6398 5496 bytes
font_01_sfnt_off00007610.bin
c05b78c4b456518e85922ee9e103c19ffcbc77433970b47b5ef883302b9fa63f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7610 10152 bytes