Malicious PDF — malware analysis report

Static analysis result for SHA-256 4616691f29bfab46…

MALICIOUS

PDF

46.3 KB Created: 2020-08-01 00:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14fafe9b9946487cc2aba98d239e5b96 SHA-1: 8f60e84c3ae48ec5babc24b5ff44222a211aa86a SHA-256: 4616691f29bfab4640b22c5a3b880da4af0849607433ddc51da730daa53c0f1e
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.ru/pify?keyword=accounting+information+systems+13th+edition+pdf+download', is designed to lure users into clicking it under the guise of a software download. The ML classifier also strongly indicated maliciousness. The document structure suggests it's a link farm, with many embedded URLs pointing to various PDF files, likely to manipulate search engine results.

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.ru/pify?keyword=accounting+information+systems+13th+edition+pdf+download
    • http://files.fhsguidance.com/uploads/1/3/0/7/130775222/rifanagozamusax.pdf
    • http://files.montgomery-chamber-music.org/uploads/1/3/2/6/132681325/1565923.pdf
    • http://files.karenhk.com/uploads/1/3/1/8/131856672/dowik.pdf
    • https://cdn.shopify.com/s/files/1/0431/3926/8765/files/sokikidejotepuda.pdf
    • https://cdn.shopify.com/s/files/1/0431/2766/8890/files/78736374102.pdf
    • https://cdn.shopify.com/s/files/1/0434/3542/5944/files/vunebuxi.pdf
    • https://cdn.shopify.com/s/files/1/0438/0416/4257/files/71225446845.pdf
    • https://cdn.shopify.com/s/files/1/0437/2529/1674/files/terigabekom.pdf
    • https://cdn.shopify.com/s/files/1/0434/7170/0120/files/bugifom.pdf
    • https://cdn.shopify.com/s/files/1/0429/9427/0371/files/fusaxusuraguvadosigezom.pdf
    • https://cdn.shopify.com/s/files/1/0433/2670/1723/files/99955108655.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nunixa.pdf
    • https://cdn.shopify.com/s/files/1/0430/6268/9946/files/33461460676.pdf
    • https://cdn.shopify.com/s/files/1/0433/2044/3045/files/dilinoj.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_off0000643c.bin
1c15cb5056d9632a824ce1cfc34ca3218d13900049df20f9d06cb4891566faf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x643C 5852 bytes
font_01_sfnt_off00007811.bin
922e0c751090598b80012f568a03624cb477f54c5c3f8586b03d75c5c7ec5e31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7811 11236 bytes
font_02_sfnt_off00009df1.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DF1 4324 bytes

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