Malicious PDF — malware analysis report

Static analysis result for SHA-256 437bb00f67b91a68…

MALICIOUS

PDF

39.6 KB Created: 2020-08-27 14:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc27ce357d9610fe027175eb1d9f0e1b SHA-1: fa7e43255aa29a5060a619aa6d2f6136f7f849ca SHA-256: 437bb00f67b91a687baa8f9b58d7e822f1f84238331a1359d02bbb362ee1a37e
152 Risk Score

Malware Insights

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

This PDF file contains a lure related to "Antz movie questions and answers" and embeds multiple external links. One of these links, https://ttraff.com/pify?keyword=antz+movie+questions+and+answers, is identified as a malicious redirector. The PDF also hosts a large number of other PDF files on cdn.shopify.com, suggesting a link farm or SEO poisoning tactic. The ML classifier 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=antz+movie+questions+and+answers
    • http://sezumikev.mikasasaki.com/uploads/1/3/1/4/131437064/xutazujofilenu-safozodan.pdf
    • https://cdn.shopify.com/s/files/1/0431/0227/3703/files/75421040958.pdf
    • https://cdn.shopify.com/s/files/1/0440/8626/3960/files/zogaxiduvola.pdf
    • https://cdn.shopify.com/s/files/1/0428/2325/4179/files/92168073053.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70934180934.pdf
    • https://cdn.shopify.com/s/files/1/0433/8355/4206/files/rujoviwav.pdf
    • https://cdn.shopify.com/s/files/1/0439/7416/4638/files/lalowarapelot.pdf
    • https://cdn.shopify.com/s/files/1/0428/1437/4054/files/32854115908.pdf
    • https://cdn.shopify.com/s/files/1/0433/6012/5080/files/2401495349.pdf
    • https://cdn.shopify.com/s/files/1/0432/0860/5859/files/juzuneravufosupafuxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4313/5393/files/why_are_my_steam_downloads_so_slow.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_off00005d83.bin
c1b3ae9fdcacece4794e23a0129dc3fdeee8be07f01b7dbe1ba77a7bf505493f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D83 5256 bytes
font_01_sfnt_off00006f60.bin
ca003ad1c13e847c0a04ba3aab668212f0457e9a659c18ca0f1256755dcaa1a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F60 10088 bytes

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