Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7f74007d9d3008…

MALICIOUS

PDF

42.3 KB Created: 2020-08-21 22:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de94f3d36bbaaeffdbe32bbb9e2bd2bb SHA-1: 3f0f92dd7c9721fb61fca956ba657cfca93db4d1 SHA-256: ab7f74007d9d3008eedd306592d06692010c286b4107df6db0283f7c54126eef
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/pify?keyword=candela+italy+application+form'. This URL is embedded within the document body, suggesting a social engineering lure to trick the user into clicking it. The presence of a large number of external PDF links, many pointing to potentially malicious or unknown domains, further supports the malicious intent. The ML classifier also strongly 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.com/pify?keyword=candela+italy+application+form
    • http://mowopesu.wingateroadrunners.com/uploads/1/3/0/7/130740257/5352394.pdf
    • http://files.randiandmike.com/uploads/1/3/2/6/132695418/814a0df88387ab0.pdf
    • http://files.deansvillehorseshoeclub.com/uploads/1/3/2/6/132681212/4519249.pdf
    • http://bezujad.bristolbaycrew.com/uploads/1/3/1/4/131453598/zegukivurepopiraxulu.pdf
    • https://cdn.shopify.com/s/files/1/0447/6259/5477/files/public_administration_syllabus_for_ias.pdf
    • https://cdn.shopify.com/s/files/1/0432/8855/9782/files/public_finance_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/6880/1695/files/physics_waves_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/3065/9750/files/40445050079.pdf
    • https://cdn.shopify.com/s/files/1/0435/8835/4207/files/21037760638.pdf
    • https://cdn.shopify.com/s/files/1/0440/6660/3158/files/webigilubow.pdf
    • https://cdn.shopify.com/s/files/1/0437/2286/6839/files/sorevesabipujesisoxaluku.pdf
    • https://cdn.shopify.com/s/files/1/0431/5024/6054/files/zitevivedifatufemirisopi.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6166/files/tagutifore.pdf
    • https://cdn.shopify.com/s/files/1/0434/6331/1513/files/43945509382.pdf
    • https://cdn.shopify.com/s/files/1/0437/4626/3201/files/miwip.pdf
    • https://cdn.shopify.com/s/files/1/0433/9692/3543/files/72031386375.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_off00006744.bin
7a8e5da8ccb401a5b12ee54d30723c0d0108979dc1c3b59509a760a46e8ec0ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6744 5132 bytes
font_01_sfnt_off000078ab.bin
ce5c592a4b220f3348d4da2aa3e7dcab394146a27417c24bdce82f90ed9ed37c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78AB 10472 bytes

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