Malicious PDF — malware analysis report

Static analysis result for SHA-256 b27cefa6fc1d59d5…

MALICIOUS

PDF

128.4 KB Created: 2020-09-01 01:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 292a6f996bb7bf88b9873323f236e1d4 SHA-1: 0b0063fa01ddfd33d460828b0b0992c8ad8f3d3e SHA-256: b27cefa6fc1d59d5a03fe08598517288c6bcd092e62c444761a1873aebc8c9aa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/wix?keyword=atpl+airframe+and+systems+pdf'. This indicates the document's primary purpose is to redirect users to a potentially harmful site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the malicious URL is sufficient evidence for the attack pattern.

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=atpl+airframe+and+systems+pdf
    • https://static.usrfiles.com/ugd/429b25_0fc7ffd5de534f80a8c9d61238eb418f.pdf
    • https://static.usrfiles.com/ugd/b8c837_2d69e7d67fab432a97d0fad4414a40cc.pdf
    • https://static.usrfiles.com/ugd/0adedf_7b374c8c084e4bb1aa48224fcb8b9c58.pdf
    • https://static.usrfiles.com/ugd/a4d998_82163fa5f3c24941ae35614c0c471d87.pdf
    • https://static.usrfiles.com/ugd/b8c837_7bef9d7553bf483db6b99ee3ce34d3a3.pdf
    • https://static.usrfiles.com/ugd/2e16aa_01f7c7f5bfec43f691893253f5903091.pdf
    • https://static.usrfiles.com/ugd/eb6612_58b1ebbe90564415ada9fa3b9c344731.pdf
    • https://static.usrfiles.com/ugd/b8c837_182db166c3ec49599cd72e90960aaf03.pdf
    • https://static.usrfiles.com/ugd/b8c837_6af8fe385d894162a2a89e7976411d9d.pdf
    • https://cdn.shopify.com/s/files/1/0440/3511/3110/files/capacitores_ejercicios.pdf
    • https://cdn.shopify.com/s/files/1/0430/8392/3609/files/free_death_anniversary_invitation_templates.pdf
    • https://static.usrfiles.com/ugd/b8c837_1cd0c15b13944d3c8c0a7ccd19bb429c.pdf
    • https://static.usrfiles.com/ugd/0cd019_4e4da6ae545345f5b7505516c1d8159e.pdf
    • https://static.usrfiles.com/ugd/48f461_df2370b814c24312b4167664552b9b62.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019e54.bin
4e66f5f3776886948c42c65cee257e17e3508057f48fb109db25271e93682233		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19E54 4956 bytes
font_01_sfnt_off0001af0f.bin
2ff25f7baebc725aa2900e8d43bcb39584e254252be59963890529c32fbc69f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF0F 17940 bytes
font_02_sfnt_off0001e656.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E656 4324 bytes

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