Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b704d5d7347346f…

MALICIOUS

PDF

43.7 KB Created: 2020-08-15 03:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bc46ef5a203dd76484c67993d933530 SHA-1: 4c83961f41e157bbb864ab17d7adb30af9df5366 SHA-256: 2b704d5d7347346f284c12a11fe12bba86b40745ab773a251e12b747ff5bf8f7
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link farm and a redirector to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The primary malicious URL identified is https://ttraff.ru/pify?keyword=define+findings+in+report+writing, which is likely used to direct users to further malicious 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=define+findings+in+report+writing
    • http://files.peterson-equipment.com/uploads/1/3/0/8/130874326/7437663.pdf
    • https://cdn.shopify.com/s/files/1/0437/1080/8216/files/sopogepexonajomod.pdf
    • https://cdn.shopify.com/s/files/1/0433/3119/0952/files/fujoxog.pdf
    • https://cdn.shopify.com/s/files/1/0429/1143/2857/files/38093122859.pdf
    • https://cdn.shopify.com/s/files/1/0444/6945/2967/files/mcmurry_organic_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0439/8225/8334/files/bears_schedule_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/soparuvuridove.pdf
    • https://cdn.shopify.com/s/files/1/0434/6642/4470/files/niluxaxegipe.pdf
    • https://cdn.shopify.com/s/files/1/0428/6971/9196/files/73098424466.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_off00006e48.bin
4a40ec5fe011065c8e695bd61e701b544951f94a2bab92895303ab1e9a6c4493		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E48 5056 bytes
font_01_sfnt_off00007fa9.bin
a50d9e53ed6cd466374be616a0b9adaaab52ad0a7bf6ec50935eeba4f8fe8bfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA9 10208 bytes

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