Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f272fa0a123b326…

MALICIOUS

PDF

40.4 KB Created: 2020-08-21 09:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d63d04e6af86426102576071172dba8c SHA-1: f408406664bac61a53f5036a0998439c5d8c120c SHA-256: 5f272fa0a123b326da7421557d029d84a8a5868e8dcbbc97c813067bb8761a07
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, also contains a URL pointing to the same malicious redirector. The presence of a link farm and a high ML classifier score indicate malicious intent, likely to redirect users to phishing or malware distribution sites.

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/pify?keyword=continuous+femoral+nerve+block+ultrasound+guided
    • http://files.libertyrecbc.com/uploads/1/3/1/1/131163512/3865817.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8962/5241/files/4230453546.pdf
    • https://cdn.shopify.com/s/files/1/0429/7513/3859/files/nubapupelurevabusaso.pdf
    • https://cdn.shopify.com/s/files/1/0431/4352/8609/files/lideb.pdf
    • https://cdn.shopify.com/s/files/1/0440/4409/1557/files/nufezajubivenowizatelotif.pdf
    • https://cdn.shopify.com/s/files/1/0435/4395/3563/files/23194938580.pdf
    • https://cdn.shopify.com/s/files/1/0434/6835/7796/files/4.pdf
    • https://cdn.shopify.com/s/files/1/0431/4346/3069/files/32766385315.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7349/files/dajemi.pdf
    • https://cdn.shopify.com/s/files/1/0439/9906/8310/files/25338378296.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_off00005ab9.bin
890aa3047eeeb80bdd24068b465b7a59ef80aded32782eadaf87a9f774bec577		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AB9 5508 bytes
font_01_sfnt_off00006d64.bin
cea2c77bbe03cabc42094e76a34f0cf71d807c8710c95a4f12bd5add4e660877		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D64 12040 bytes

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