Malicious PDF — malware analysis report

Static analysis result for SHA-256 390cc1a3b7cb658c…

MALICIOUS

PDF

31.7 KB Created: 2020-09-12 07:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 000b45b5ae2d12149b04d089f1043617 SHA-1: 4cac172ee0237a02c2d0fa8ebb6b1fa4bb7c1e49 SHA-256: 390cc1a3b7cb658cd734432efc57cf087545e3043ede36d7dd9cbbaa1d7e5e1a
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=cation+vs+anion+worksheet'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on 'static.usrfiles.com'. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains the same URL, suggesting the primary intent is to trick the user into clicking the malicious link.

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=cation+vs+anion+worksheet
    • http://files.princealbertchamber.com/uploads/1/3/0/7/130776083/7b5213f98.pdf
    • https://static.usrfiles.com/ugd/10e3af_4e5db791052e4d17a68ba8793ac2569e.pdf
    • https://static.usrfiles.com/ugd/10e3af_a522badfff8f4e43b65fd78c829a970e.pdf
    • https://static.usrfiles.com/ugd/314c35_04045e2af1f54f2288b780193dfb74c0.pdf
    • https://static.usrfiles.com/ugd/12dc78_f0e5de275ddb4dfc99f57f0a7a14395c.pdf
    • https://static.usrfiles.com/ugd/2f7815_0bb097243cb84f309953ceac8a9146b5.pdf
    • https://static.usrfiles.com/ugd/dd4472_fdf1813d792a49c5b3f6f494a401387d.pdf
    • https://static.usrfiles.com/ugd/c83fdb_4d62c329426b46e28142231b4300d2be.pdf
    • https://static.usrfiles.com/ugd/0582e0_8f81b9c43d344748afdd2a8c60e9891a.pdf
    • https://static.usrfiles.com/ugd/607883_07120762802742c694ca2f153bd00902.pdf
    • https://static.usrfiles.com/ugd/08e331_3d113e8b2d3e4223a957c51bd48de54d.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_off000040dd.bin
8a38ef6984b8d81e9159d9b6d9ec94098dd062ec14753434833411b0ab0343f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x40DD 4864 bytes
font_01_sfnt_off00005171.bin
ae31f630b5e5655d687adf48bb5bcc32872960828cd1236ebac0d2f95b04b272		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5171 9840 bytes

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