Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccdd91870cb9a1a8…

MALICIOUS

PDF

46.7 KB Created: 2020-08-31 23:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2fcecc8751fd7f9adb40a9a8ce19011 SHA-1: 9bac8c9ee6f52af2944f7276daa8e1eef5b0d851 SHA-256: ccdd91870cb9a1a8e7e15160280b20cce356324460a92965eaa55a48f52b9cba
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/wix?keyword=pre+primer+sight+words+worksheets+free', is designed to lure users with the pretext of free educational materials. The PDF also exhibits characteristics of a link farm, with numerous external PDF links, suggesting a broader distribution or SEO-poisoning campaign. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/wix?keyword=pre+primer+sight+words+worksheets+free
    • https://static.usrfiles.com/ugd/b8c837_0697826bc07b4bbaa386c49c0ddceb51.pdf
    • https://static.usrfiles.com/ugd/c7a620_12668c588d3b45e080aa93e136bf482b.pdf
    • https://static.usrfiles.com/ugd/b8c837_438e1362bc0744e18a14f7939ea4c637.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0c0ceca269946ed84108e499f627310.pdf
    • https://static.usrfiles.com/ugd/902d29_d949cb43255a4d798c4b95c4421b18f6.pdf
    • https://static.usrfiles.com/ugd/e4a001_590b40207b8d43d8a2482f0a6385a8e0.pdf
    • https://static.usrfiles.com/ugd/76b6de_cbd9b29840b246f39959bb636d450099.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/66209340812.pdf
    • https://cdn.shopify.com/s/files/1/0430/4830/4797/files/goruvowivomu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9814/files/emergency_medicine_physician_cv_template.pdf
    • https://cdn.shopify.com/s/files/1/0436/7322/3321/files/centrifugation_methods.pdf
    • https://cdn.shopify.com/s/files/1/0437/6428/5598/files/wofitawobileto.pdf
    • https://static.usrfiles.com/ugd/8b2c09_e02570c6e84a4c729b3876013c1f9311.pdf
    • https://static.usrfiles.com/ugd/b8c837_ea145fc830984c73b15303f77353c4a6.pdf
    • https://static.usrfiles.com/ugd/accd1f_082fd9a770e7447d88f932b56b54afe5.pdf
    • https://static.usrfiles.com/ugd/2f8cea_5eae95827fdb4f368bc0c299efc40623.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069ab.bin
444b34a66ae25cbbec88434d127b0a113a86fca25220f31918d1a3c0284766b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x69AB 5052 bytes
font_01_sfnt_off00007aed.bin
088210d16991e6cd1244abf3664ac277970abedb185eac59c1e85ef91090825f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AED 10748 bytes
font_02_sfnt_off00009f9d.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9F9D 4324 bytes