Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c954c9db134f62d…

MALICIOUS

PDF

54.3 KB Created: 2020-08-04 09:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41d7b0f24b87d08f3ccc2a772b670e16 SHA-1: 0c51b39b936b52ee1a4808780b72b94793ab026a SHA-256: 6c954c9db134f62d5f4c8d490a02876b3544cb9bf1269b5692022dd740dca545
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a link farm designed to manipulate search engine results. One prominent link redirects to a malicious URL, indicating a phishing or redirection attempt. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a malicious campaign.

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=automobile+engineering+interview+questions+pdf+download
    • http://dumabevof.ephilippines.org/uploads/1/3/0/7/130740013/fosate.pdf
    • http://files.taofineart.com/uploads/1/3/2/6/132681504/9562f1e84ed2.pdf
    • http://files.mannahomesne.com/uploads/1/3/1/4/131410311/mufemavemojidazil.pdf
    • http://files.aziragroup.com/uploads/1/3/0/7/130775557/385d0395.pdf
    • http://files.kapaxsolutions.com/uploads/1/3/1/4/131437873/bd7da26ffde.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/7679/4021/files/25705933900.pdf
    • https://cdn.shopify.com/s/files/1/0434/7405/9430/files/98864956251.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2095/files/xorapelawimigegojev.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/8108324603.pdf
    • https://cdn.shopify.com/s/files/1/0434/9516/2022/files/nurumosowofapinoxoko.pdf
    • https://cdn.shopify.com/s/files/1/0428/5808/6559/files/6060521203.pdf
    • https://cdn.shopify.com/s/files/1/0435/7446/0579/files/42100019760.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0660/files/37113802357.pdf
    • https://cdn.shopify.com/s/files/1/0428/9147/7148/files/96954257479.pdf
    • https://cdn.shopify.com/s/files/1/0440/5038/2998/files/gonosilufubarikibonuxivoj.pdf
    • https://cdn.shopify.com/s/files/1/0438/0708/0610/files/90081731924.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/waxigulazatep.pdf
    • https://cdn.shopify.com/s/files/1/0429/6104/3605/files/78154232892.pdf
    • https://cdn.shopify.com/s/files/1/0434/6819/3952/files/93979894431.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000959b.bin
cd0478d16cd95ce1ffb8c25be9dcd0019abbbf02c93537616a5477f263803272		 pdf-font-stream PDF embedded font (sfnt) at offset 0x959B 5768 bytes
font_01_sfnt_off0000a934.bin
94fde7035627a692112c4d1f57b8efec0540be363e76667d13e81be40ad7bc89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA934 10032 bytes

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