Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab5e596c418ec88…

MALICIOUS

PDF

53.6 KB Created: 2020-08-22 22:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc5a6a3c72c2b37271ba38960aaf0574 SHA-1: 3aa7a7990a7d799471cfd51ca9af0805365b449a SHA-256: 7ab5e596c418ec88de8145bb60bc3d72c6bd51abea64ef0a3ea2f5fd0ce812f6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru', which is part of a link farm strategy. It also contains numerous embedded links, many hosted on Shopify, designed to appear legitimate but likely leading to malicious content. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the target URL and keywords suggesting a lure.

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=amar+audio+songs+kannada
    • http://tubozoj.kawaiimonomono.com/uploads/1/3/1/4/131455636/6369716.pdf
    • http://files.unholyknowledge.com/uploads/1/3/0/8/130874317/bfc724.pdf
    • https://cdn.shopify.com/s/files/1/0438/2274/3712/files/vefotebulagapanovukab.pdf
    • https://cdn.shopify.com/s/files/1/0440/3625/9990/files/que_es_el_marketing_de_guerrilla.pdf
    • https://cdn.shopify.com/s/files/1/0429/4452/8550/files/procom_heater_parts.pdf
    • https://cdn.shopify.com/s/files/1/0435/0256/7588/files/kendo_scheduler_editor_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/8852/7013/files/61684846810.pdf
    • https://cdn.shopify.com/s/files/1/0431/1282/4993/files/16284293421.pdf
    • https://cdn.shopify.com/s/files/1/0432/7279/8373/files/62731161751.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8395/files/zafovurisijawedul.pdf
    • https://cdn.shopify.com/s/files/1/0448/1482/7677/files/snake_game_python_code.pdf
    • https://cdn.shopify.com/s/files/1/0432/9114/8454/files/29349283251.pdf
    • https://cdn.shopify.com/s/files/1/0448/0204/8160/files/markstrat_report.pdf
    • https://cdn.shopify.com/s/files/1/0445/6343/1588/files/amnioscopia_procedimiento.pdf
    • https://cdn.shopify.com/s/files/1/0428/5841/4236/files/fefapudotiraxok.pdf
    • https://cdn.shopify.com/s/files/1/0436/1663/2992/files/coreldraw_to_online_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d31.bin
a2264ced97c4908b3031946a1ddb8c69b4426166369f5a9e8a307c32bba2b09f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D31 4852 bytes
font_01_sfnt_off00008d7d.bin
197d360eab57657d75385e10a52fa05a7cb689fee504f93cfde76aaa7a0da063		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D7D 14540 bytes
font_02_sfnt_off0000bb80.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB80 4324 bytes

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