Malicious PDF — malware analysis report

Static analysis result for SHA-256 049a4c3d2e061384…

MALICIOUS

PDF

42.8 KB Created: 2020-08-10 07:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88660b0c8b4e1de22e2b1d0d9e672ac0 SHA-1: 38cab654b6843472c4d6d098fbc0d798bf69143d SHA-256: 049a4c3d2e061384449c7434a61d7fcefbd490816cd82bd58c67d0b07c81df29
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to malicious redirector infrastructure, specifically pointing to 'ttraff.ru'. The document body also contains this URL, presented as a link to 'cambridge fce past papers pdf', indicating a lure. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external links, many of which point to Shopify-hosted PDFs, suggesting an attempt to manipulate search engine results or distribute content broadly. The ML classifier also strongly flagged this PDF as malicious.

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.ru/pify?keyword=cambridge+fce+past+papers+pdf
    • http://nenuvu.fcchartselle.com/uploads/1/3/0/8/130814328/gawejew.pdf
    • http://volesarud.saintgeorgechurchok.org/uploads/1/3/0/9/130968917/pejaxaki.pdf
    • http://files.classicgolfcarts.com.au/uploads/1/3/0/7/130775725/8015904.pdf
    • https://shop.swiss-exams.ch/produkt-katego
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9094/3904/files/bumekigisedinowemimopi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rajijabobuzev.pdf
    • https://cdn.shopify.com/s/files/1/0436/6575/2217/files/vakijasudemimesunaduxowab.pdf
    • https://cdn.shopify.com/s/files/1/0433/9616/9886/files/kuzored.pdf
    • https://cdn.shopify.com/s/files/1/0433/7713/1683/files/anatomy_of_human_body_books.pdf
    • https://cdn.shopify.com/s/files/1/0430/9277/0977/files/parikug.pdf
    • https://cdn.shopify.com/s/files/1/0435/1390/5311/files/42307880681.pdf
    • https://cdn.shopify.com/s/files/1/0431/6859/6117/files/25961799023.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/wavumabopasajenumig.pdf
    • https://cdn.shopify.com/s/files/1/0431/5083/5878/files/texesivefidetivalewade.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/10809735118.pdf
    • https://cdn.shopify.com/s/files/1/0436/3563/8425/files/landfill_bioreactor_design_and_operation.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_off00006873.bin
5d0239e9a53b5d520b9fdefd6b672575a6b9bbcab02ad1120d5598b1bfad66e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6873 5488 bytes
font_01_sfnt_off00007afe.bin
4df097cc518ea36388e0cc9424a1b69fa95daeff9a84896c6e6198be82ab3930		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFE 10352 bytes

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