Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d0409fcf97597e…

MALICIOUS

PDF

33.5 KB Created: 2020-08-14 05:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9c1d75d9ae8a2ff8e7ab020126e7d13 SHA-1: ed30a95c69302387c6b85ff13ed5ce8d5602f4bf SHA-256: 13d0409fcf97597e0d249a541e407b199cd29149adbf5784845e4cfdcc1adbfc
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, which is a common tactic for phishing and malware distribution. The document body, though heavily obfuscated, contains the same redirector URL and numerous other links to PDF files hosted on various domains, suggesting a link farm or a method to obscure the true malicious destination. The ML classifier strongly indicated maliciousness.

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=simple+equations+worksheet+tes
    • http://files.brewwtravels.com/uploads/1/3/0/9/130969663/difuw-kafogonunoxapi.pdf
    • http://matewaj.byhisgracehymns.com/uploads/1/3/1/4/131406947/gujevoxixuretakis.pdf
    • http://zafafo.elizabethfremantle.com/uploads/1/3/1/3/131397989/sodipet.pdf
    • http://neves.therelaxationpoint.com/uploads/1/3/1/4/131406717/2514400.pdf
    • http://files.clear-heater.co.uk/uploads/1/3/2/6/132696263/374a84c4d8746.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/sepogo.pdf
    • https://cdn.shopify.com/s/files/1/0437/8427/4069/files/wedding_photography_poses_bride_and_groom.pdf
    • https://cdn.shopify.com/s/files/1/0428/6454/1852/files/23864655903.pdf
    • https://cdn.shopify.com/s/files/1/0430/7868/0727/files/fox_sports_m3u8.pdf
    • https://cdn.shopify.com/s/files/1/0432/9734/1604/files/61411501496.pdf
    • https://cdn.shopify.com/s/files/1/0433/4524/8407/files/anatomy_of_neck_spaces.pdf
    • https://cdn.shopify.com/s/files/1/0431/1079/3370/files/asterix_e_cleopatra_portugues.pdf
    • https://cdn.shopify.com/s/files/1/0434/0501/7255/files/ranch_king_mower_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/8213/0332/files/zezas.pdf
    • https://cdn.shopify.com/s/files/1/0428/4727/3116/files/baponawafuwezidediluko.pdf
    • https://cdn.shopify.com/s/files/1/0430/6042/8962/files/sabejijugigusagazizef.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_off000046dd.bin
5fbd30bd1c8aa979050549629b7902535e8830fca880e5f4a6a3e75b54cd5aa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46DD 5444 bytes
font_01_sfnt_off0000593f.bin
50b3d8ecf2ae66a2b0ca0126fa39ceb123e5f38cd4347605e5d73df7d7e81ffc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x593F 9360 bytes

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