Malicious PDF — malware analysis report

Static analysis result for SHA-256 d75459e21dc91a0a…

MALICIOUS

PDF

45.9 KB Created: 2020-08-11 21:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1e9f9afb1a994c671d49bd31963e490 SHA-1: 6a79fda75c398811557280622bb7999ef63cbf21 SHA-256: d75459e21dc91a0a6d9e4cb03e2b28135fa9e11208456d2d5beb7da272beaa49
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at ttraff.com. This suggests a link farm or SEO poisoning tactic designed to lure users to malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=angle+of+repose+pdf+stegner
    • http://files.gowanuswines.com/uploads/1/3/2/8/132814182/98576f7d.pdf
    • http://files.argos101media.com/uploads/1/3/2/6/132696077/xuwetus.pdf
    • http://files.chittendenpreventionnetwork.com/uploads/1/3/1/4/131452838/nunojabad.pdf
    • https://cdn.shopify.com/s/files/1/0432/6958/7104/files/nolizilek.pdf
    • https://cdn.shopify.com/s/files/1/0432/6758/8252/files/gepamunu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3631/8616/files/24486247455.pdf
    • https://cdn.shopify.com/s/files/1/0434/9850/4354/files/1996_subaru_legacy_outback.pdf
    • https://cdn.shopify.com/s/files/1/0431/5352/2850/files/8723305148.pdf
    • https://cdn.shopify.com/s/files/1/0435/6797/2515/files/pujazifalar.pdf
    • https://cdn.shopify.com/s/files/1/0438/1173/3664/files/zofowuloti.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21883700101.pdf
    • https://cdn.shopify.com/s/files/1/0430/1357/0709/files/lexaxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6142/7867/files/80434912138.pdf
    • https://cdn.shopify.com/s/files/1/0433/7546/0517/files/alluvial_landforms.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_off0000771a.bin
6c5fcf440fcba84809091aec25fabbcc2cc25f69e153d8d983ca1aa75b3c20e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x771A 4988 bytes
font_01_sfnt_off00008825.bin
f0a886de95c94edc05141909a2a3373f2b72864e12fa61fbac4e93f9f46f808b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8825 10252 bytes

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