Malicious PDF — malware analysis report

Static analysis result for SHA-256 b34c3f9d33640822…

MALICIOUS

PDF

36.2 KB Created: 2020-08-26 01:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed8b336f55cc79c90c416b3f3200197a SHA-1: 7a88120678d09099b65b692db4e8b94efcd872b6 SHA-256: b34c3f9d336408228c9792abe63b5df162ff96826553545fcd60f47c58f8c6ae
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body itself appears to be obfuscated or corrupted, but the presence of the malicious redirector URL and the link farm heuristic indicate a likely attempt to lure the user to malicious sites, potentially for malware distribution.

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=a+alongada+sombra+do+amor+de+mathias
    • http://files.valeriekabov.com/uploads/1/3/1/3/131398258/8946794.pdf
    • http://funis.wigbate.com/uploads/1/3/1/3/131384401/mudamin.pdf
    • http://files.emzflowerboutique.com/uploads/1/3/1/6/131606492/fipifagin.pdf
    • http://files.drwilliammunro.com.au/uploads/1/3/0/7/130775462/pomepinuwisowesexer.pdf
    • https://cdn.shopify.com/s/files/1/0444/4664/6439/files/acrobat_editor_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0436/1653/4690/files/headway_beginner_test.pdf
    • https://cdn.shopify.com/s/files/1/0428/6627/8556/files/jakuji.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/reragijod.pdf
    • https://cdn.shopify.com/s/files/1/0436/1594/4867/files/gupeginofumubuxawajizabis.pdf
    • https://cdn.shopify.com/s/files/1/0428/8741/3923/files/46347495745.pdf
    • https://cdn.shopify.com/s/files/1/0443/9814/9798/files/changeling_the_dreaming_20th_anniversary.pdf
    • https://cdn.shopify.com/s/files/1/0431/5539/0630/files/lovitalunow.pdf
    • https://cdn.shopify.com/s/files/1/0431/6866/1670/files/lojesedizaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81667611697.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_off00004c8e.bin
39239fd3c8e941913118ef187d8c8b300f64a39d7df30d7b950b865070c19762
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C8E 5368 bytes
font_01_sfnt_off00005e9b.bin
c3779c8643293e5b66a50be37c20338089e960b3d044cfa976781caaf8af3fb6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E9B 11516 bytes