Malicious PDF — malware analysis report

Static analysis result for SHA-256 31bfcf2d5c174182…

MALICIOUS

PDF

51.7 KB Created: 2020-08-29 17:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38dc2bc0f5a4f1c61a64695d3104332d SHA-1: 366ecd32c64507976fcdc840b40753a998ee71ec SHA-256: 31bfcf2d5c17418284dd905031c7ba31ba799d7751b9f578084b47607fb55687
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains embedded links that redirect to a known malicious domain, ttraff.com. The document body, though heavily obfuscated, contains references to a movie title and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of numerous external PDF links, many pointing to static.usrfiles.com, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious.

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.com/wix?keyword=the+spy+next+door+2010+dual+audio
    • https://static.usrfiles.com/ugd/b8c837_49c0bb5a1f304146933fcab6fabf1e78.pdf
    • https://static.usrfiles.com/ugd/b8c837_20b40999307347f894b197bbabb4e867.pdf
    • https://static.usrfiles.com/ugd/b8c837_c18c34ad10884e728dd5f90b0d3ff43b.pdf
    • https://cdn.shopify.com/s/files/1/0435/9100/8418/files/dalod.pdf
    • https://cdn.shopify.com/s/files/1/0438/9791/3512/files/analog_and_digital_data_transmission.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e552a6c1f93481cbe7628d07a5771c6.pdf
    • https://static.usrfiles.com/ugd/b8c837_e1101caecdcf4652871983865634502c.pdf
    • https://static.usrfiles.com/ugd/b8c837_33adcd80ba124b5bb80f15f7cc9a040d.pdf
    • https://static.usrfiles.com/ugd/b8c837_99629299280b4f74b9c96dbba9db3d3d.pdf
    • https://cdn.shopify.com/s/files/1/0436/7328/8869/files/1792935433.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4484/files/10382179962.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_off00007c3e.bin
96f72725b09cd08fdc4109ca06b1a6f9159e6c6e8e136fab6c2bdc30ebf6403a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C3E 5492 bytes
font_01_sfnt_off00008ef0.bin
3503db3516a4a0b766f6d6135f254005f44799805c07b179856cb126e29d490c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF0 16812 bytes

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