Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5d40e8022a4a35…

MALICIOUS

PDF

40.2 KB Created: 2020-09-24 03:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0025e159fe8d3c22db18ace6ed0057db SHA-1: 1808c9cd34fff35db3a4d9352db48d4908852ad8 SHA-256: db5d40e8022a4a35c06dd0e79016e81680fa2ec990ba97b545dc8a8b4da56557
150 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure at https://ttraff.cc/pify. Another critical heuristic indicates a PDF link farm, suggesting a large number of outbound links to potentially malicious or SEO-spam content. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains the same URLs, reinforcing the malicious intent.

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/pify?keyword=letter+of+transfer+of+church+membership+presbyterian
    • http://files.disciplesoutpost.org/uploads/1/3/0/7/130740510/5229b69d0b26a.pdf
    • http://wesaz.designed2stick.com/uploads/1/3/2/6/132681300/depemawelaxos-zagebot-rabupuwes-meduwe.pdf
    • http://files.gillespiecoalmuseum.org/uploads/1/3/1/8/131856338/89a71e7c27.pdf
    • http://files.sugarshells.net/uploads/1/3/1/0/131070911/6644455.pdf
    • http://dexawusuf.arabesqueetc.com/uploads/1/3/1/4/131406082/a2d141b8e7c1.pdf
    • http://files.lucky13salon.com/uploads/1/3/1/4/131406835/6977863.pdf
    • http://gavazuf.columbiabands.org/uploads/1/3/0/8/130874090/fusezusurazukibe.pdf
    • https://61b38d61-a49f-41ce-8fdc-8d9d98d700d3.filesusr.com/ugd/d6af85_b4b873835150416d9906b129296d25e2.pdf?index=true
    • https://e566a844-e0c7-4107-8c7b-1f15f87e5880.filesusr.com/ugd/a43ec6_8b3c8b40edec47a5af8d3b6c13f63daf.pdf?index=true
    • https://e3869a3a-fd4c-4280-8fbd-34e523652fe5.filesusr.com/ugd/9c8fb9_5f5443c3f7ff468b8fa28ce2efc26d32.pdf?index=true
    • https://19b88fde-0201-4a62-9268-2ca016610ef5.filesusr.com/ugd/9df9d6_c504055b34f144549b12a6b5691f366f.pdf?index=true
    • https://67b90e5a-c99b-4b11-ab21-a3a832f9333a.filesusr.com/ugd/c068f8_b77b9ecd153447bb86e4259b35abbb40.pdf?index=true
    • 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_off00005f49.bin
f5b380fb2fc1e5a3d990b7393ef16f3810746a8253fdfde8b1b1aba8d4ea4721		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F49 5408 bytes
font_01_sfnt_off0000718d.bin
fba3e783b4e659489c9242de19821854ba2525f63179fa62c1d2e16e1950ebb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x718D 10084 bytes

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