Malicious PDF — malware analysis report

Static analysis result for SHA-256 a20ceb8e6ac77461…

MALICIOUS

PDF

50.2 KB Created: 2020-08-30 00:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f43b1e6835340f7658ec7e5d262c8740 SHA-1: 4f7ddfaa7a772fae97d604304086184d6ad1db0a SHA-256: a20ceb8e6ac7746114e708f5580ef8a59e89b18167965abe2cee8ee06826e934
152 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 'ttraff.com'. This URL is presented within the document body, disguised as a chapter summary, indicating a phishing or content-luring attack. The PDF also exhibits characteristics of a link farm, with numerous external links, further supporting the malicious intent of redirecting users to potentially harmful sites. No scripts were extracted, but the presence of malicious URLs and the ML classifier's high confidence score strongly suggest a malicious document.

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=sons+and+lovers+chapter+3+summary
    • https://cdn.shopify.com/s/files/1/0433/3617/1688/files/54419087156.pdf
    • https://cdn.shopify.com/s/files/1/0433/2643/9582/files/renazuzome.pdf
    • https://cdn.shopify.com/s/files/1/0437/7313/2954/files/ruborupiwawaperetuzox.pdf
    • https://cdn.shopify.com/s/files/1/0438/8493/7384/files/pdf_splitter_iphone_app.pdf
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/xufezu.pdf
    • https://static.usrfiles.com/ugd/7f46b5_34076d7a67054e31acaf17a2ce4edd89.pdf
    • https://static.usrfiles.com/ugd/d2cc1f_66d79cf5566b4618b8ec4e283d15a528.pdf
    • https://static.usrfiles.com/ugd/bd5c68_d668cb7a572c4c4c9d9de50580871760.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b7039da0d7347e782c7dc53500da723.pdf
    • https://static.usrfiles.com/ugd/4b874d_46aad64cbc08441eaceee4308d569167.pdf
    • https://static.usrfiles.com/ugd/0049ca_288549bc837448758f27abde38be254a.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab510ceca5b543cf8b782a77f8b8efb8.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_off00008782.bin
6558022e1edc41d84fff0bb5e0b1941625ea36ea55ba150188f9fea14d11c6c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x8782 5744 bytes
font_01_sfnt_off00009ae7.bin
fd389b69fc51a984d5d1029d9e648993226d9d0842d9576478a13c7bebe8375e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9AE7 9656 bytes