Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6bd415be71f03f5…

MALICIOUS

PDF

45.2 KB Created: 2020-08-16 23:39:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd4bf5ac306f1b4e59e203187518846e SHA-1: 4c53a6e83a014667dc31ab3c627e91872be49f8c SHA-256: f6bd415be71f03f540c58f4a114efb0faf226553a8ac5c4aec309eaf96cc09cf
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier also strongly indicated maliciousness. The primary malicious URL, https://ttraff.com/pify?keyword=barauni+junction+ka+platform, is a known redirector. The document body contains obfuscated text and numerous embedded URLs, including the malicious redirector and links to benign-looking PDFs hosted on Shopify, likely to appear legitimate.

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=barauni+junction+ka+platform
    • http://files.halltosuccess.com/uploads/1/3/2/6/132681066/3289088.pdf
    • http://files.chloescheel.com/uploads/1/3/0/8/130813042/5d7fab6f.pdf
    • https://cdn.shopify.com/s/files/1/0439/4768/8091/files/bash_shell_scripting.pdf
    • https://cdn.shopify.com/s/files/1/0433/1782/1605/files/60239979816.pdf
    • https://cdn.shopify.com/s/files/1/0439/9972/3678/files/6091025764.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/72461951145.pdf
    • https://cdn.shopify.com/s/files/1/0434/1386/4604/files/can_t_save_hosts_file.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/naduz.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/12484977226.pdf
    • https://cdn.shopify.com/s/files/1/0429/2568/6951/files/punebovotiwateb.pdf
    • https://cdn.shopify.com/s/files/1/0437/3184/5271/files/zepogukafafanixugito.pdf
    • https://cdn.shopify.com/s/files/1/0428/7181/6358/files/97460949466.pdf
    • https://cdn.shopify.com/s/files/1/0433/3414/0056/files/dubolutejukuninavuzej.pdf
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/11527059019.pdf
    • https://cdn.shopify.com/s/files/1/0440/4301/0198/files/bulk_density_procedure.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_off00006739.bin
eb989154e45407005230050e1b62fd85b195197489e5ff86852928eac91a5757		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6739 4936 bytes
font_01_sfnt_off000077e4.bin
b8dc134928eb5b1ab291e539d74c2402484955a3023e589ff39fb81a417feb4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77E4 9940 bytes
font_02_sfnt_off00009a08.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A08 4324 bytes

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