Malicious PDF — malware analysis report

Static analysis result for SHA-256 825fae17ed6243a0…

MALICIOUS

PDF

40.8 KB Created: 2020-08-30 17:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c87f01f17fdb82cf24aeed4b8ee45af7 SHA-1: 307ccdfd8d36817f88366d777e134f5c9c585b09 SHA-256: 825fae17ed6243a0c84c227a2b9f1dd83cc3e3a155d5e975ba46c28948447836
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malicious redirector link and a large number of embedded links to external PDFs, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is https://ttraff.cc/wix?keyword=dr+seuss+poems+about+friendship, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains this URL and references to other PDF files, reinforcing the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=dr+seuss+poems+about+friendship
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/5413/5456/files/rarojovoka.pdf
    • https://cdn.shopify.com/s/files/1/0432/5805/2763/files/bsp_party_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/5272/0543/files/smoke_detector_circuit_using_ic_555.pdf
    • https://static.usrfiles.com/ugd/b8c837_23cbb0ad6bea40678c8891ef98565bb8.pdf
    • https://static.usrfiles.com/ugd/c0fca2_ea613cefdd934db4bb02909eef13a739.pdf
    • https://static.usrfiles.com/ugd/36f25b_068c100c9a094fc09c14e90a2d2542a7.pdf
    • https://static.usrfiles.com/ugd/33ab24_72446b4088c7461ba8785cefb40e444c.pdf
    • https://static.usrfiles.com/ugd/8acad3_fd90f6bbc72745069e870e4c27d6546d.pdf
    • https://static.usrfiles.com/ugd/b8c837_f7d85ffc7e1344a5ac97b1d8aeef9855.pdf
    • https://static.usrfiles.com/ugd/b8c837_3960b0e47166470a835d2421d50ee26f.pdf
    • https://static.usrfiles.com/ugd/b8c837_24eca2a73b324c8b913d0c713845b476.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_11c7f06c52244a1db435fc35459cf207.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061a6.bin
227d33f08f2aed6cf05c55be37fde7797c20186ba236b5fe09a9c2ef667807ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x61A6 5388 bytes
font_01_sfnt_off000073bf.bin
380639cc8e6f5ab9d0bbf4f951f0f7463eee8c843888d646ea5f503a0709a942
pdf-font-stream PDF embedded font (sfnt) at offset 0x73BF 10240 bytes