Malicious PDF — malware analysis report

Static analysis result for SHA-256 305b25fdc09e9ada…

MALICIOUS

PDF

39.7 KB Created: 2020-08-29 10:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0dd3725172d68332f007adc6958760ee SHA-1: b423243fe95bf56e05c8eeead4e661c5ca73e15a SHA-256: 305b25fdc09e9ada9cdd876c492ef3a57885acf39ae10fb46561ce0b9992754f
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure at 'ttraff.ru'. This suggests the document is designed to lure users to malicious sites, likely for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

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.ru/wix?keyword=new+leaf+rehab+cookeville+tn
    • https://cdn.shopify.com/s/files/1/0431/2986/4343/files/bhagavatam_book_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0438/5567/5552/files/what_does_a_piccolo_sound_like.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70934180934.pdf
    • https://static.usrfiles.com/ugd/b8c837_41dbeb698bd24e83b59ff60dc4f5f003.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ea50097fd1344778fc09c232cb3b066.pdf
    • https://static.usrfiles.com/ugd/b8c837_69260b6ea10e4c69897655aa39b009b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_6db835f7c19a4bc39160607643d781e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_74487c5bcda54da7bfe0a2637c3759d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_70ea986a99f647a39e252f77bb668ac2.pdf
    • https://static.usrfiles.com/ugd/b8c837_f41a8859f25d45dcbd7a04a152a7f783.pdf
    • https://static.usrfiles.com/ugd/b8c837_d41ebc1c0c414217ba1cb1f3862fb80d.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_off00005d4b.bin
973ad294e21bd12d78ddc1f15dc79e1bb6ae736c72a124910f8bb793e3154d46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D4B 5116 bytes
font_01_sfnt_off00006ecb.bin
9a1352e24fe737e5de3915cf50bfb7468401a5bcd4cdab57401e9368431f3f33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ECB 10612 bytes

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