Malicious PDF — malware analysis report

Static analysis result for SHA-256 e423f0b52084dd94…

MALICIOUS

PDF

39.7 KB Created: 2020-08-25 16:39:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec3b247fcfc1ebbce8a4fa960287dfa8 SHA-1: c9a29c0e46f071bb6b1052f25fb7ee97a619e0ef SHA-256: e423f0b52084dd9418b56ab5241216b1824655c2cb05f4c3c7c8e219f235401f
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external PDFs, with one primary link identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains the URL https://ttraff.com/pify?keyword=introduction+to+agribusiness+management+pdf, which is the entry point for the redirection chain. The presence of a link farm suggests an attempt to obscure the malicious destination and potentially leverage SEO techniques for 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.com/pify?keyword=introduction+to+agribusiness+management+pdf
    • http://files.takeabreakfromtheinterstate.org/uploads/1/3/2/6/132682806/nimuten-rimibubuxad-mikojisubexiron.pdf
    • http://sofit.christopherkrieg.com/uploads/1/3/1/0/131071157/f89bc.pdf
    • http://gedulu.knox-united.com/uploads/1/3/0/8/130814328/fajawutere.pdf
    • http://jujam.trebalmusic.com/uploads/1/3/2/7/132710712/2b4f03f5b.pdf
    • https://cdn.shopify.com/s/files/1/0445/9456/1188/files/xasetulemimafosiziludigom.pdf
    • https://cdn.shopify.com/s/files/1/0436/7518/9401/files/wigomuxutugituzoto.pdf
    • https://cdn.shopify.com/s/files/1/0433/4904/9494/files/human_anatomy_and_physiology_with_pathophysiology_tortora.pdf
    • https://cdn.shopify.com/s/files/1/0432/3291/9720/files/block_abdominal_ultrasound_step_by_step.pdf
    • https://cdn.shopify.com/s/files/1/0439/3612/0990/files/city_of_heroes_mastermind_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/1674/1286/files/tukuligidaxixu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9100/0472/files/kotor_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0435/3340/2266/files/ridebofadibibedabuzivaga.pdf
    • https://cdn.shopify.com/s/files/1/0430/2195/9325/files/mawojexagegizefu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8110/5562/files/72066060621.pdf
    • https://cdn.shopify.com/s/files/1/0433/6815/3253/files/91061716237.pdf
    • https://cdn.shopify.com/s/files/1/0429/2775/1321/files/37264656036.pdf
    • https://cdn.shopify.com/s/files/1/0434/1386/4604/files/4e_manual_of_the_planes.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/
    • https://cdn.shopify.com/s/files/1/0434/1386/4604/files/4e_manual_of_the_p

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ac9.bin
0ef0192bc20243f7261bee907dacce5dabdc8709b075cb38612a816d9d4b55a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC9 5520 bytes
font_01_sfnt_off00006d6d.bin
369da4c14d6518030b44104edecda61c76a49cc63b3192c349162efb715edc46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D6D 10680 bytes

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