Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3b74ae26ff0e7c…

MALICIOUS

PDF

41.4 KB Created: 2020-08-10 22:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0abc9ba790195f8c0308d14e51e325e3 SHA-1: f2d29aa94b0e74941d47d0c7f0c0114c1b442dc2 SHA-256: 5f3b74ae26ff0e7c7fe3d2c02183ba36a7c6cda94587e075f01ef9baf6d2cf75
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, ttraff.com, disguised as a Zelda guide book PDF. The PDF also features a large number of external links, many of which are to benign Shopify domains, but some are to unknown domains that could host further malicious content. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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=zelda+breath+of+the+wild+guide+book+pdf
    • http://fipuxez.littlesprouts.org.uk/uploads/1/3/0/8/130813420/2fef2.pdf
    • http://files.house-of-grace.org/uploads/1/3/1/3/131384098/jexosidewuno-kevava-mubugoruxuxu-tivaranolo.pdf
    • http://rifib.mealprepdaily.com/uploads/1/3/2/7/132710797/7712e63.pdf
    • http://files.lakeeriefishingderby.com/uploads/1/3/0/7/130740073/1847694.pdf
    • http://files.bcdancepassion.com/uploads/1/3/1/6/131606697/4494339.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/2558647817.pdf
    • https://cdn.shopify.com/s/files/1/0429/2440/8991/files/18675671349.pdf
    • https://cdn.shopify.com/s/files/1/0429/5055/7855/files/laritoja.pdf
    • https://cdn.shopify.com/s/files/1/0439/5050/6152/files/36318238272.pdf
    • https://cdn.shopify.com/s/files/1/0431/7793/5004/files/cubical_type_theory.pdf
    • https://cdn.shopify.com/s/files/1/0433/7618/1400/files/jilumujuparopa.pdf
    • https://cdn.shopify.com/s/files/1/0431/9435/1778/files/bofarem.pdf
    • https://cdn.shopify.com/s/files/1/0430/9932/4567/files/gezilerefojekubo.pdf
    • https://cdn.shopify.com/s/files/1/0439/1642/7419/files/jedikuzujejifokadupibi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5732/2903/files/ff15_max_level.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27347714529.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_off00006367.bin
c726570ca80c4f852978ec17d6577f4651787a0e89997980858f0efcc33d667a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6367 5376 bytes
font_01_sfnt_off000075be.bin
2328202e4acf45aa1c1a6f7fdfd7c95c393997a60efbff30a216c35cf8f3e474
pdf-font-stream PDF embedded font (sfnt) at offset 0x75BE 10184 bytes