Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5e1ebf7df24a77…

MALICIOUS

PDF

48.8 KB Created: 2020-09-01 02:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6526061668f8815ac99d146a4477440 SHA-1: 25228425066dca5262306fe518402e9d9429571b SHA-256: 5d5e1ebf7df24a77b3adfde14bb4fcfc70d9bc517c6200bfe7edc17952edae32
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL related to 'calvin klein size guide boxers'. This suggests a phishing or scam attempt designed to trick users into visiting a compromised site. The PDF also hosts a large number of external links, indicating it is part of a link farm, likely for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence point to 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=calvin+klein+size+guide+boxers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/a2ebd8_6adec540340540f681fa91897fdbeec2.pdf
    • https://static.usrfiles.com/ugd/b47706_3606549696cc4c2988bd17553dffca05.pdf
    • https://static.usrfiles.com/ugd/57c819_965e9f690eb04e10ad7d2f65dbe8c6c0.pdf
    • https://static.usrfiles.com/ugd/6924eb_0be3500577574568abd96db77682a2d0.pdf
    • https://static.usrfiles.com/ugd/b48b60_96f32b5f9c0844909cbbed8146c602cb.pdf
    • https://static.usrfiles.com/ugd/3d0627_8c58c6e8f6a546178fe553a04b0a6b0e.pdf
    • https://static.usrfiles.com/ugd/e6092c_3415ad25ab7d42afb25c833dc927d159.pdf
    • https://static.usrfiles.com/ugd/9421c8_e85809fa027d4477a27c1cb4bf0d5524.pdf
    • https://static.usrfiles.com/ugd/f3cb45_30683c71c788497397962f04917174f6.pdf
    • https://static.usrfiles.com/ugd/72b0e7_e0824a933567461e9639b870c2fc1a70.pdf
    • https://static.usrfiles.com/ugd/80bfa9_7238e6b9c3704c9c8fe7c9d687cf2d26.pdf
    • https://static.usrfiles.com/ugd/1f2646_ba56821d8e644075916b8936f6609916.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_577f58080b894a37ad9544ddf460c2d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_2834bcfd68bd46e392f192ff386ad85c.pdf
    • https://static.usrfiles.com/ugd/724bd4_fbeec59970a04a0dbe4f5e2916190c12.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_off00007835.bin
291e4a90cc496f843f9fe5bcc070006d1b9c25b6dcc0bd419b7bf7cdaf39f42e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7835 5280 bytes
font_01_sfnt_off00008a42.bin
fe8a2bf860f8ef0b97b47316fe346c27b28528756860d6aa0997d9c7df7a104f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A42 14072 bytes

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