Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d906b5ae74f058…

MALICIOUS

PDF

46.0 KB Created: 2020-08-18 22:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e73217d1c50eeaf65a88dd49ece3f199 SHA-1: 3a73153df66353f69b922021b5f81341c6b8b3fd SHA-256: d5d906b5ae74f0584715f920dfef9820ad582080be540bfb0c7605046a21bd13
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=aix+nim+interview+questions+and+answers'. The document body, though heavily obfuscated, contains this URL and appears to be a lure related to interview questions. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify domains, likely to obscure the malicious redirector. The ML classifier strongly indicates maliciousness.

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=aix+nim+interview+questions+and+answers
    • http://jirapuju.ourladyoflourdesparish.ca/uploads/1/3/1/3/131383837/duzit_lidaxuduf.pdf
    • https://cdn.shopify.com/s/files/1/0434/8100/6244/files/87226282112.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6353/files/a_world_of_pain_awop_v5._01.pdf
    • https://cdn.shopify.com/s/files/1/0452/3799/3629/files/anaconda_python_32_bit_windows.pdf
    • https://cdn.shopify.com/s/files/1/0429/2355/7030/files/lusuguzajavixodu.pdf
    • https://cdn.shopify.com/s/files/1/0440/6866/7542/files/aetna_medicare_prior_authorization_form_radiology.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4624/files/85882107563.pdf
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/misulizamapin.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/jesunokujebizesimulapus.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_off00006e2e.bin
ebbf28fa3ac7d72a29e4870fa04c5200f54479342bf0140fbe676cffd92650e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E2E 5272 bytes
font_01_sfnt_off0000800a.bin
b7ceb94653d6792b10519a9c6c917dab7e9010c3cb3fbc2f07f845042b4c08bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x800A 13728 bytes

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