Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96724a43db6e967…

MALICIOUS

PDF

43.7 KB Created: 2020-08-19 08:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e40bd6bb7a8f161ffe599d550f3048d SHA-1: d14d388700c6d07628a45539799f8360d6c8d957 SHA-256: b96724a43db6e967264efc31b23cedd386326bcc66d1ef0273c301fd29715bc6
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a technique often used for SEO manipulation or to distribute malicious content. One of the embedded links, 'https://ttraff.cc/pify?keyword=all+saints+academy+plymouth+sixth+form', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create spam or phishing documents.

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=all+saints+academy+plymouth+sixth+form
    • http://zoteg.ciptippresents.com/uploads/1/3/1/3/131379803/xalufofujimaf_wutetenog_pawaj_nosepamejix.pdf
    • http://files.beaconbeerco.com/uploads/1/3/0/7/130776268/7e2c5486f1a98.pdf
    • http://files.wingdomgroup.com/uploads/1/3/0/7/130739021/wifib.pdf
    • https://cdn.shopify.com/s/files/1/0428/4314/4359/files/zebobudinepatedir.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/15714929785.pdf
    • https://cdn.shopify.com/s/files/1/0441/3738/2040/files/55421152634.pdf
    • https://cdn.shopify.com/s/files/1/0440/1430/5430/files/iphone_6_landscape_width.pdf
    • https://cdn.shopify.com/s/files/1/0435/3179/6629/files/esc_2020_atrial_fibrillation_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0427/4028/5607/files/lowevojirus.pdf
    • https://cdn.shopify.com/s/files/1/0429/7624/7971/files/dojimozopof.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_off000060f1.bin
583f583d184e00be8fde2b5168309a6792499d1db1b909e35d3314e35c224858		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60F1 5556 bytes
font_01_sfnt_off000073ab.bin
716f0cfbe18da1b05cb81f4e4d7a5b38f8f3bd5249584bb95f72281f5357f2d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73AB 15256 bytes

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