Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6f8a775b02eb97…

MALICIOUS

PDF

62.6 KB Created: 2020-08-09 09:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cd5f32dc70dd02c8d85268b7f242542 SHA-1: 1470cb34d56b36cef5d2f10c17369a28139584cd SHA-256: 9a6f8a775b02eb9780ae719a6c67eb60713941cc3b093fd3bc0c078dc25eabe4
152 Risk Score

Malware Insights

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

The PDF contains a deceptive title related to stomach cancer risk factors, but its primary function is to act as a link farm. It embeds numerous external links, including a critical redirector link to 'ttraff.ru', which is known malicious infrastructure. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

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=cancer+de+estomago+factores+de+riesgo+pdf
    • http://files.mymvmtpods.com/uploads/1/3/0/9/130969633/7930936.pdf
    • http://files.fritzandmischelljewelry.com/uploads/1/3/0/7/130738822/8850471.pdf
    • http://files.aimhealthgta.com/uploads/1/3/0/7/130739024/fc20855a152d.pdf
    • https://cdn.shopify.com/s/files/1/0428/9839/1196/files/puraxubikimibiviguk.pdf
    • https://cdn.shopify.com/s/files/1/0437/1234/8315/files/ibps_aptitude_questions_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0434/3490/1660/files/63071494191.pdf
    • https://cdn.shopify.com/s/files/1/0437/6081/2190/files/kenmore_110_washer.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36149341097.pdf
    • https://cdn.shopify.com/s/files/1/0439/3720/2344/files/discord_can_t_hear_other_people.pdf
    • https://cdn.shopify.com/s/files/1/0433/2886/4409/files/xejowuxisiboximoguvadu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6905/5911/files/651397850.pdf
    • https://cdn.shopify.com/s/files/1/0435/8062/0963/files/jawapawuvogilaxuge.pdf
    • https://cdn.shopify.com/s/files/1/0439/4529/6027/files/el_alcoholismo_en_la_adolescencia.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4701/files/43683972175.pdf
    • https://cdn.shopify.com/s/files/1/0438/9427/6264/files/meilleur_livre_pour_apprendre_l_espagnol.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_off0000b2dd.bin
acd66e765267b02006689fd9912c593951c575b1afe794b056c60fcb89e510c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DD 5348 bytes
font_01_sfnt_off0000c4f7.bin
abbdae6067260a54d9474868b3370b2d91d4387b5f71d5c8f4e45ca31379866c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F7 11940 bytes