Malicious PDF — malware analysis report

Static analysis result for SHA-256 055a719fca7afab4…

MALICIOUS

PDF

47.3 KB Created: 2020-08-30 16:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5323137ab4ecb8599cc4c542412a13e SHA-1: 790a44493f0191364458726d0c84f75b27d51f16 SHA-256: 055a719fca7afab41bdbc97f7c16d4e0cbf74b8ab391af5fb90c910d888c550b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, a common tactic for SEO link farms and phishing. One prominent link directs to a known malicious redirector, indicating a malicious intent to lead the user to harmful content. 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.ru/wix?keyword=way+over+yonder+in+the+minor+key
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1335/8247/files/minimalism_documentary_full.pdf
    • https://cdn.shopify.com/s/files/1/0431/2956/9434/files/aspects_score_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0433/8624/1189/files/koges.pdf
    • https://cdn.shopify.com/s/files/1/0434/0734/3779/files/3192042981.pdf
    • https://static.usrfiles.com/ugd/314c35_807cd44e4cf9454eb3ca9692451f73d5.pdf
    • https://static.usrfiles.com/ugd/b8c837_4b28dbd51aa849438d16c2af0ff31a96.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca7bd45308a040af9b29010b968ec1ce.pdf
    • https://static.usrfiles.com/ugd/b8c837_14492a5b817b407e9619eeece6462cb9.pdf
    • https://static.usrfiles.com/ugd/b8c837_08e756bc544b49d0911562dc1fd8912a.pdf
    • https://static.usrfiles.com/ugd/e5cbe5_6e8c55a883c54e5b8abbea2baa192fc7.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005233.bin
7b41c92fa54ffeca6b9d74067f38a075e9a34456e314152d95468cccfb3068d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5233 13008 bytes
font_01_sfnt_off00007c20.bin
f461ce2a1e565ebee4b87189aa16d1ada1c9a56aea76d4c94a4d25c7209ebc37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C20 5096 bytes
font_02_sfnt_off00008d55.bin
89bde2d462d0ae045b094b7b1410aa308c64285ad3e5da9845646934e3afe3c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D55 10300 bytes

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