Malicious PDF — malware analysis report

Static analysis result for SHA-256 6129a02eb3d2859b…

MALICIOUS

PDF

44.5 KB Created: 2020-08-22 09:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8d8148a7301d56ed3fa9326fe8b5e0e SHA-1: 950f2ae6fffc9bdb16db4e364aa70182cd8ace85 SHA-256: 6129a02eb3d2859b0994064ea16d47d759c80c8e24844510b7a5408c042216e0
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One prominent link, 'https://ttraff.cc/pify?keyword=infosys+aptitude+test+questions+and+answers+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other PDF links, indicating an attempt to trick users into clicking malicious or SEO-abusing links. The ML classifier also 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.cc/pify?keyword=infosys+aptitude+test+questions+and+answers+pdf
    • http://files.rjhomecontractor.com/uploads/1/3/1/4/131437157/7205456.pdf
    • https://www.gamblingid.com/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/2064/6562/files/zejolod.pdf
    • https://cdn.shopify.com/s/files/1/0434/8398/8125/files/solucion_hipertonica_preparacion.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5002/files/sejularisenitife.pdf
    • https://cdn.shopify.com/s/files/1/0430/5197/4818/files/cadbury_dark_milk_nutritional_information.pdf
    • https://cdn.shopify.com/s/files/1/0433/8850/2174/files/bosiderudozosifa.pdf
    • https://cdn.shopify.com/s/files/1/0431/1531/5349/files/mexexugejaxaliru.pdf
    • https://cdn.shopify.com/s/files/1/0456/8419/5487/files/nilij.pdf
    • https://cdn.shopify.com/s/files/1/0437/6517/0334/files/full_album_sites_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/7443/7791/files/74461986655.pdf
    • https://cdn.shopify.com/s/files/1/0433/7175/7718/files/48566977005.pdf
    • https://cdn.shopify.com/s/files/1/0431/4028/4573/files/ruvolapixeluko.pdf
    • https://cdn.shopify.com/s/files/1/0427/4916/5734/files/54777567808.pdf
    • https://cdn.shopify.com/s/files/1/0437/1464/2069/files/cavidades_cardiacas.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6016/files/manual_de_usuario_sisbe_banco_de_venezuela.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_off00006f51.bin
ce3e1a56c53f87f1fb56f6ae24f17296d62871d4bfd62190fd0a52a2a5c117a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F51 5260 bytes
font_01_sfnt_off00008157.bin
96614f2d84150bd81cbe317c8d27b6c4d27a1382a6e92c2a301ea1d91cda8f69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8157 10528 bytes

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