Malicious PDF — malware analysis report

Static analysis result for SHA-256 aabfb60481057b23…

MALICIOUS

PDF

112.6 KB Created: 2020-07-25 21:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f56d89f67aeeaa934180c45f07200392 SHA-1: 4057e8ffcbb74fc4ac800ab6f715351bea4c6787 SHA-256: aabfb60481057b23b84f16c15f079977a9652b0d6746cdbe50c9e7ca408201c7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be malformed or obfuscated, preventing a clear understanding of its user-facing purpose beyond the presence of links. No scripts were extracted from this sample.

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=bleacher+report+top+100+nba+players+2020
    • http://files.thisgirlstees.com/uploads/1/3/2/6/132681985/tuludini.pdf
    • http://files.genified.com/uploads/1/3/1/8/131856771/tefozonepi.pdf
    • http://files.meghanjaneyoga.com/uploads/1/3/0/9/130969220/gibizo_kufazi_gizuto_dutenulobozisa.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/25476853319.pdf
    • https://cdn.shopify.com/s/files/1/0432/2725/0850/files/mutunexozuzafomoripuf.pdf
    • https://cdn.shopify.com/s/files/1/0427/4490/5884/files/lubejulemanonafonal.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/niriliruvurufuwupaku.pdf
    • https://cdn.shopify.com/s/files/1/0430/6498/3703/files/55423169318.pdf
    • https://cdn.shopify.com/s/files/1/0436/6788/2134/files/55973634615.pdf
    • https://cdn.shopify.com/s/files/1/0429/1811/7543/files/39589108472.pdf
    • https://cdn.shopify.com/s/files/1/0431/7977/0019/files/86610379158.pdf
    • https://cdn.shopify.com/s/files/1/0430/8706/9348/files/kekinutowutekirapodo.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_off00017f2b.bin
14dcdbb69f8bc2c66d806d5efbf9292985c14a09d07f8302766a65eddc5d4051		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17F2B 5376 bytes
font_01_sfnt_off0001915c.bin
b7303dcd51c6e3a8b1dd1457842fed28a53de64acb068d14dd53912c36449d7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1915C 10324 bytes

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