Malicious PDF — malware analysis report

Static analysis result for SHA-256 db09bfe78f4d0261…

MALICIOUS

PDF

38.5 KB Created: 2020-08-04 10:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc35f3a19cf3c3d8db02bb0da88ecf72 SHA-1: 3d52ba8013188192ead142075f22b538eff828ef SHA-256: db09bfe78f4d0261c03483c4bc9bfca2862747a140afc33c560e9c156e7df608
152 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Absite surgery pdf free download' and includes the malicious URL, suggesting a lure for users to download potentially harmful content. 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.cc/pify?keyword=absite+surgery+pdf+free+download
    • http://files.ijss-sn.com/uploads/1/3/2/6/132695668/xusawipubej.pdf
    • http://files.mrsmartelsclass.org/uploads/1/3/1/3/131382274/03b517ebdf41db2.pdf
    • http://files.heatherleerogerspoetry.com/uploads/1/3/0/9/130969465/29d05c8e33cc.pdf
    • http://files.my-english-coach.com/uploads/1/3/2/7/132712306/30d692.pdf
    • http://files.mohicounseling.com/uploads/1/3/1/8/131857390/fuvifefosexeg.pdf
    • https://cdn.shopify.com/s/files/1/0433/9977/4364/files/14344651015.pdf
    • https://cdn.shopify.com/s/files/1/0433/9728/3996/files/ubuntu_kill_process.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vaxopegi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0128/2711/files/kerun.pdf
    • https://cdn.shopify.com/s/files/1/0433/9531/7918/files/49486412026.pdf
    • https://cdn.shopify.com/s/files/1/0427/4490/5884/files/9479422636.pdf
    • https://cdn.shopify.com/s/files/1/0429/0389/6230/files/kupelexubefivivu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0708/0608/files/nogumafaguv.pdf
    • https://cdn.shopify.com/s/files/1/0428/8669/3023/files/55774991434.pdf
    • https://cdn.shopify.com/s/files/1/0439/7367/3118/files/13579913934.pdf
    • https://cdn.shopify.com/s/files/1/0430/9165/6864/files/resinasudesuzafog.pdf
    • https://cdn.shopify.com/s/files/1/0429/5426/0633/files/2006_toyota_sienna_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/0221/5069/files/1585368481.pdf
    • https://cdn.shopify.com/s/files/1/0430/9634/2695/files/27106357753.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_off00005809.bin
a04f14fa5f2af2b765221303faf9463d283f924912986179c72873f7335f21b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5809 5532 bytes
font_01_sfnt_off00006af9.bin
7820989d5e71b49a56ee46fc5cbd94c48d70051d7c6644fd89d15c7063364c1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF9 9872 bytes

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