Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe404895bcb2e41…

MALICIOUS

PDF

43.5 KB Created: 2020-09-02 11:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a03a756e383973d495489b4ecbf31580 SHA-1: 711a5aa4c8fcdc5095837643c7d5774096c22fd8 SHA-256: bfe404895bcb2e4138bcd93bb4fc78873a5098220d5487df446fe426b8e11045
150 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as malicious, specifically for containing a redirector link to `ttraff.cc` and a large number of external links. The ML classifier also strongly indicated maliciousness. The embedded content, though partially garbled, contains the suspicious URL and appears to be part of a link farm strategy. The primary attack pattern involves luring users through these links, likely to a phishing or malware distribution site.

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=brand+new+swag+ringtone
    • https://cdn.shopify.com/s/files/1/0432/9409/7576/files/34527812070.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9209/files/the_5th_wave_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/1682/1672/files/1nf_2nf_and_3nf_are.pdf
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/lefovipegekawuzap.pdf
    • https://cdn.shopify.com/s/files/1/0433/0808/9499/files/71605624572.pdf
    • https://cdn.shopify.com/s/files/1/0429/6038/8252/files/vufazipowapufodoxinazotug.pdf
    • https://cdn.shopify.com/s/files/1/0428/7827/1641/files/giwipiruliwetebixegojinik.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/vamidivefowuruwev.pdf
    • https://cdn.shopify.com/s/files/1/0430/4361/8965/files/7982861594.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/3423639658.pdf
    • https://static.usrfiles.com/ugd/78c764_18c6006a7db842bdbe2cd01dbaafe226.pdf
    • https://static.usrfiles.com/ugd/7ef0dc_fb076d16bfd04aa78a8e016ccfa28e0f.pdf
    • https://cdn.shopify.com/s/files/1/0435/3549/9418/files/tulemekerawapufav.pdf
    • https://cdn.shopify.com/s/files/1/0432/2390/8520/files/digadetij.pdf
    • https://cdn.shopify.com/s/files/1/0430/6481/9874/files/durijawot.pdf
    • https://cdn.shopify.com/s/files/1/0437/8106/2813/files/inventory_checklist_template_free.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_off00006ac3.bin
1e275c37a832f0f87a99b26185d00c3cbee0a5191209cedfe43cad55d753a964		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC3 5104 bytes
font_01_sfnt_off00007c3f.bin
152a95d4dd6dbecbfc38283544f4d7e483dd2fda1869e434da3117236c6e0637		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C3F 10672 bytes

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