Malicious PDF — malware analysis report

Static analysis result for SHA-256 412d27b2007e05f3…

MALICIOUS

PDF

44.1 KB Created: 2020-08-29 11:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b04daf243babcc9515705438aeff0578 SHA-1: 766b50428fd201c9754d263ac4241fc6a0511a07 SHA-256: 412d27b2007e05f3e1606b2e1cc5b391e6a1104fd6d67c8006283356c3c7d3a9
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=erec+rex+book+6'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on 'static.usrfiles.com'. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be luring the user to click on the malicious link within the document.

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/wix?keyword=erec+rex+book+6
    • https://static.usrfiles.com/ugd/b8c837_ab918a06946b4d48873b31213d183f3a.pdf
    • https://static.usrfiles.com/ugd/b8c837_232f1ba59f154013bfdfcf99f5e48480.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee60ffe794b9420398a5a1d2f0fbddd4.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d82c79d688e4fb28c8073b1860b3c42.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f2190803f6a4aa79018dbb087649e63.pdf
    • https://static.usrfiles.com/ugd/8cbfce_03d02ae47eac480998702a856db38016.pdf
    • https://static.usrfiles.com/ugd/b8c837_60ac3bd222734e0d8b1566228a9cfecd.pdf
    • https://static.usrfiles.com/ugd/b8c837_73f095589cb243f5b50c5ff6b9970202.pdf
    • https://static.usrfiles.com/ugd/b8c837_ae80f6fee66a4a9f925403b7e292f7fb.pdf
    • https://cdn.shopify.com/s/files/1/0429/7719/8229/files/93796612787.pdf
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/wobegaludepuvigakadapiso.pdf
    • https://cdn.shopify.com/s/files/1/0437/2630/7480/files/ayyappa_ringtones_naa.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/
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/wobegaludepuvigakadapiso

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000714a.bin
8b120c4d1c41eb149cd4425a3ccf515962f8618b0e4d97c4e69c3530bc576b05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x714A 4756 bytes
font_01_sfnt_off0000818e.bin
6cddfef6e7464658cc90a28ed60eeff8c58a4d942b0749c9407c795bef6ab888		 pdf-font-stream PDF embedded font (sfnt) at offset 0x818E 9980 bytes

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