Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7426d0ce8f8744b…

MALICIOUS

PDF

32.8 KB Created: 2020-08-17 02:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 005f7f5f4a885cf039b8bdf723cd2ca2 SHA-1: 6db5a844f4fc2d500ac33c1df8ca03241aab91dc SHA-256: b7426d0ce8f8744bc06c579e95f1a271c77900ae4b7a0d0819c42b9dd1ebf755
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting the document's primary purpose is to distribute links to other potentially malicious content. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=tshwane+gospel+choir+o+mohau+song
    • http://files.customerfocusedlearning.com/uploads/1/3/0/7/130738814/bavajesapamukogobos.pdf
    • http://dafed.firstnewark.com/uploads/1/3/1/1/131164250/3661842.pdf
    • http://files.texassynergy.com/uploads/1/3/0/7/130738892/kumurasivip_kalonasavakete_kijawi_kazobinaxet.pdf
    • http://files.ndhumanities.com/uploads/1/3/1/4/131406403/6661230.pdf
    • https://cdn.shopify.com/s/files/1/0434/7500/9686/files/dragon_ball_z_dokkan_battle_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/25668779603.pdf
    • https://cdn.shopify.com/s/files/1/0431/5863/4658/files/78511835370.pdf
    • https://cdn.shopify.com/s/files/1/0433/9105/8076/files/wasewufapudalopan.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1520/files/59293732202.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7957/files/13999605486.pdf
    • https://cdn.shopify.com/s/files/1/0437/9662/7616/files/lumuzoxug.pdf
    • https://cdn.shopify.com/s/files/1/0429/6340/2905/files/80430860994.pdf
    • https://cdn.shopify.com/s/files/1/0431/7665/7051/files/13109617697.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_off000042cc.bin
6b84168055db7eca3ea23f71363628cc1a6ac819350cd8b6141b9867d7a2257c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x42CC 5388 bytes
font_01_sfnt_off00005503.bin
a3922d746ce89773ec8d916913eda6b95f9a51f165acc8e8493f2910b1f41a72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5503 9796 bytes

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