Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a3e91b53c8d558…

MALICIOUS

PDF

49.8 KB Created: 2020-08-31 04:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8e767cd186c87dd2a0a9d6e62ae6ba8 SHA-1: e72dcfca8499611ed3c0a933558e5a389a9668cc SHA-256: a3a3e91b53c8d5585f9fc928c2ec142aba865cb97e8b86e228924f2271b10892
154 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. One prominent URL, 'https://ttraff.cc/wix?keyword=exiled+kingdoms+where+is+amarisa', is flagged as a malicious redirector. The presence of a large number of links, many hosted on 'static.usrfiles.com', suggests an attempt to manipulate search engine results or distribute malicious content through a wide array of seemingly benign-looking documents. The ML classifier also strongly indicated 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.cc/wix?keyword=exiled+kingdoms+where+is+amarisa
    • https://static.usrfiles.com/ugd/b8c837_58fdfc4a8f1b44278fbdad7c90667232.pdf
    • https://static.usrfiles.com/ugd/b8c837_748d9a12046443da8649fccc6878d6ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_a51bde549a4b435ea3aabcaf1a2a355d.pdf
    • https://static.usrfiles.com/ugd/b8c837_35eddabeec164694aa16ed90af27fc0c.pdf
    • https://static.usrfiles.com/ugd/5899d5_8c0d59c576154a1288fb077582aabddf.pdf
    • https://static.usrfiles.com/ugd/d775a9_74e10026ead9488cb4ae9dfb1b0006b8.pdf
    • https://static.usrfiles.com/ugd/4dd980_8ed0252dc4a94226bffeb8e8389384f4.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3382/files/49979342651.pdf
    • https://cdn.shopify.com/s/files/1/0432/2007/4663/files/romantic_cartoon_couple_pic.pdf
    • https://cdn.shopify.com/s/files/1/0431/4693/6482/files/72339043336.pdf
    • https://cdn.shopify.com/s/files/1/0432/2505/5387/files/4454647870.pdf
    • https://static.usrfiles.com/ugd/10e3af_0cfa53660b0640a49f874a72ae2b2fe7.pdf
    • https://static.usrfiles.com/ugd/b8c837_341ae77d9b094c64a0fc298cbc1c6414.pdf
    • https://static.usrfiles.com/ugd/ea2f88_618b3046f5a2491ba3117d047baf290d.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061a4.bin
389b8eeccc0666412343e8fa7eadb68d56175802f1701ce5462e5e5a4bad4a7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61A4 5128 bytes
font_01_sfnt_off000072e2.bin
34ef3bf3ffd06e337107a5cd67f051763a334c4642895fce49659da83c37e6d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72E2 10588 bytes
font_02_sfnt_off00009702.bin
e5245523bd71a78e06ca3300da63f55ad096e28dd8c1a5e83e138be64f7d0aee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9702 16084 bytes
font_03_sfnt_off0000abb6.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABB6 4324 bytes

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