Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f21e5322f9b056…

MALICIOUS

PDF

44.3 KB Created: 2020-08-30 09:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a23c31e4751f5fff6a9f891f4737922 SHA-1: 2316eb9c8ad0cf2a2545aacc86cb6614b02754ac SHA-256: 67f21e5322f9b05655eca18b58699d7b7d11c2b3bc50c579253a51892a3c146a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be a link farm designed to redirect users to potentially harmful websites, possibly for SEO spam or phishing.

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=tiye+ki+baithak+format+in+english
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/3348/5727/files/virginia_beach_escorts.pdf
    • https://cdn.shopify.com/s/files/1/0428/4828/8934/files/wifavewog.pdf
    • https://cdn.shopify.com/s/files/1/0430/8975/6311/files/libepomedemupomamumo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3972/7509/files/53366734228.pdf
    • https://cdn.shopify.com/s/files/1/0433/4413/4294/files/osrs_chambers_of_xeric_solo_guide.pdf
    • https://static.usrfiles.com/ugd/b8c837_09df41dc88e24c8cb260ba7435897a25.pdf
    • https://static.usrfiles.com/ugd/7041e4_8d9227760d2049ba97dec24d520b14ba.pdf
    • https://static.usrfiles.com/ugd/a2c2bc_bfc1ea6450134515823608b1e0411e2d.pdf
    • https://static.usrfiles.com/ugd/b8c837_a5d7dc1cfffc4c32bd88f0a002258f45.pdf
    • https://static.usrfiles.com/ugd/be19e1_b4cbecba0cbf43f988f16cf3e233cd06.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e9c.bin
3bbc4c051852e9ea270a8b06e200e3be4125efba02671af6e6fd70be2bb7cf7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E9C 5436 bytes
font_01_sfnt_off000080ff.bin
2f98f17dcb0d70b2a16ea03d4086cb48a91f843c885c40f9fc4f4d21739e0683		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80FF 10744 bytes

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