Malicious PDF — malware analysis report

Static analysis result for SHA-256 d925156d79ec0ed5…

MALICIOUS

PDF

40.2 KB Created: 2020-08-29 14:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a36a81763438e14d25019569ce45bd15 SHA-1: c8ed1721ce46a9ddb4186ce5bff64aa8a8d02da5 SHA-256: d925156d79ec0ed52fd7dd824fd69fda2f1a6993913739690cc862bf69f28e1b
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.ru. The document body, though partially corrupted, contains text related to 'free lesson plans' and the malicious URL, suggesting a lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy to obscure the malicious destination. The ML classifier also 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=free+lesson+plans+for+teaching+reading+comprehension
    • https://cdn.shopify.com/s/files/1/0435/0184/6692/files/wow_classic_undead_rogue_leveling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/8814/2743/files/48208047319.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1031/files/terraria_creative_mode.pdf
    • https://static.usrfiles.com/ugd/b8c837_d49476c9d7e64cc08f1c0b212c295c3b.pdf
    • https://static.usrfiles.com/ugd/b8c837_83fcb31cc3a840999767196fe3a40d43.pdf
    • https://static.usrfiles.com/ugd/b8c837_200f364c922e45bb91bc11556e7d4c61.pdf
    • https://static.usrfiles.com/ugd/b8c837_c158ba2cfbc04189b35daf60ae48f1cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_92d19a79efe345d0bc8ffa3f4fb0913e.pdf
    • https://cdn.shopify.com/s/files/1/0436/9652/1369/files/long_610_tractor_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/6956/2266/files/47260924399.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/libuzab.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_off00005e53.bin
3293bad2035a34384f31beecf46e8c52e06a0d1c11e594e65033919f4577d502		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E53 5524 bytes
font_01_sfnt_off000070ef.bin
8d88e092d3fa6c58fef5e7fc300ded4ce0a25713c519b1271bdbeba3833a6a08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70EF 10296 bytes

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