Malicious PDF — malware analysis report

Static analysis result for SHA-256 edfce55f3023d724…

MALICIOUS

PDF

39.1 KB Created: 2020-08-21 16:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c589f52f5a1c51eed37f8bd821eba7fe SHA-1: 32bde8bd6bec7d89103da9c2c0ab219f8359d15a SHA-256: edfce55f3023d724aa43a6fc24b31e9878b497e78ed803c112e37afa2025e25c
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, which is also present in the document body. The ML classifier strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to manipulate search engine results or distribute content broadly. The primary malicious URL is a redirector designed to obscure the final destination, likely leading to further malicious content or phishing pages.

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=employee+evaluation+report+sample
    • http://bemajika.autismbuddies.org/uploads/1/3/1/8/131871390/464598e9324.pdf
    • http://tufipik.mytriplec-boutique.com/uploads/1/3/1/4/131453150/222894.pdf
    • https://cdn.shopify.com/s/files/1/0435/0181/3915/files/wozirepenifafesuxutajew.pdf
    • https://cdn.shopify.com/s/files/1/0431/2950/3901/files/netherlands_road_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/6938/2568/files/bokuwiboso.pdf
    • https://cdn.shopify.com/s/files/1/0433/1021/9432/files/gapalisaro.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6000/files/bixuluxosabaxaboxader.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bibekejufalakudogaloseja.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/walezilufotalenuzodumis.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20675343362.pdf
    • https://cdn.shopify.com/s/files/1/0436/5575/7977/files/45592413757.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_off00005c9c.bin
d42e9feac1953d932255c3292aa49220778509feaf548e942605a9cc1fb5adb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C9C 5084 bytes
font_01_sfnt_off00006dda.bin
8cf5b7c8eea7e76387913a36781d582f25780f87262feb3b0a2f7df998f1e946		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DDA 9884 bytes

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