Malicious PDF — malware analysis report

Static analysis result for SHA-256 1426d8297be1ba1d…

MALICIOUS

PDF

41.6 KB Created: 2020-08-31 18:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14ba6a6ed797fa7c39becb7c4c13c2b5 SHA-1: 90e3bd29d7b573449bf9deec55462eea251b1871 SHA-256: 1426d8297be1ba1dbe6db7b4377bbad69ad5284b042dc7d26ff05d720e5cb940
154 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, a technique often used to create link farms for SEO manipulation or to redirect users to malicious sites. One such link, 'https://ttraff.ru/pify?keyword=camera+test+app+android', is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

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/pify?keyword=camera+test+app+android
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/e4ff69_5b9d51750b1a42059d19b83ad636c95c.pdf
    • https://static.usrfiles.com/ugd/b8c837_34adb5eaa6b245c2b452b7330120860a.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb243ba64c664cde867e4be476f46504.pdf
    • https://static.usrfiles.com/ugd/b8c837_8581a4d7beba450d876d853152e6d3e9.pdf
    • https://static.usrfiles.com/ugd/078c79_df3d9579fb06406cb387049d0bdf3ef3.pdf
    • https://static.usrfiles.com/ugd/a2c2bc_9c6b971f6e46408b9b8efcbab9a5f1f6.pdf
    • https://static.usrfiles.com/ugd/f7fbc8_b3bf08b02ad34d7e81d19e935bd2b6c4.pdf
    • https://static.usrfiles.com/ugd/a467d2_d327c9628868454ab2a5ff29ebef4ad9.pdf
    • https://static.usrfiles.com/ugd/538d67_8f9626e769304f20963b6ca578f0fb14.pdf
    • https://static.usrfiles.com/ugd/b8c837_d2a1fcf02e7b413fa64c9be161872fc0.pdf
    • https://static.usrfiles.com/ugd/3826db_c3e16c272fc6443ca27a06bdaea9d557.pdf
    • https://static.usrfiles.com/ugd/a4e402_febab50c6f23440a9e4b288008cef4ae.pdf
    • https://cdn.shopify.com/s/files/1/0431/5879/8492/files/4227715803.pdf
    • https://cdn.shopify.com/s/files/1/0430/8038/4674/files/305869957.pdf
    • https://cdn.shopify.com/s/files/1/0438/4188/0224/files/algebraic_expressions_worksheet_6th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0438/7920/2984/files/foloke.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_off00006587.bin
fdcab64094a5a20f4a0f8892d91fe71f48ba40bbcfb33678f21b2197ed7239b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6587 4976 bytes
font_01_sfnt_off00007653.bin
9c78661f69aa46b7f274bee3fe5abdd521a96364a9f75d1172a538a42fb63f6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7653 10196 bytes

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