Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfb2805adddf37f…

MALICIOUS

PDF

39.8 KB Created: 2020-08-30 11:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4044be45a747768d50f9378c1ab27e3c SHA-1: 5f1d5fa61ee7d3236dbb307fe0dbad51152c068c SHA-256: ecfb2805adddf37f2ceb8a76b7bae2e777b8e1de88eec0dadf22120316fb42ef
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to known malicious infrastructure. The document body, though heavily obfuscated, contains text related to 'Manuales de taller volkswagen gratis' and includes the URL https://ttraff.ru/wix?keyword=manuales+de+taller+volkswagen+gratis, which is flagged as malicious. Additionally, a PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external PDF links, with https://static.usrfiles.com/ugd/f80014_ed9ab51ae2604390b4cca1b51fcd1d4b.pdf being the first listed.

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=manuales+de+taller+volkswagen+gratis
    • https://static.usrfiles.com/ugd/f80014_ed9ab51ae2604390b4cca1b51fcd1d4b.pdf
    • https://static.usrfiles.com/ugd/0cd3a8_bd4a8beb8ce7455aafe348a17a1310f5.pdf
    • https://static.usrfiles.com/ugd/e2b09b_6b38bad7e88344b4948bf3eac09d73ae.pdf
    • https://static.usrfiles.com/ugd/d54300_977a60ff066c428ca1a2849b81c91111.pdf
    • https://static.usrfiles.com/ugd/b8c837_0509c4930e4f42fbb07dcd56a78f5ac6.pdf
    • https://static.usrfiles.com/ugd/b8c837_323949b27eb4474eb77a73467dd604b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_7e21ccbca95d4bb39aa29dc03c6e41eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a3b37f170d244a4b7b7ee49d1f1d659.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b4fa96a895548398f8c04da09081cb1.pdf
    • https://static.usrfiles.com/ugd/3ab5ed_f0828534e4f64b8b81e0081dd49dffb3.pdf
    • https://static.usrfiles.com/ugd/0bcf16_d400426b03624081ae285968cb713d7d.pdf
    • https://static.usrfiles.com/ugd/b8c837_b53e9525bd1749be8c2034ce0e38c3fb.pdf
    • https://static.usrfiles.com/ugd/912de2_4ba522bbf2fd4b8bbb0690924b82b0b9.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_off00005e7c.bin
4171b162562624c52b7d71937b2ec45f0379be34cd050f3ef40d1c23f140548b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E7C 5212 bytes
font_01_sfnt_off00007061.bin
15c7a2b4368a91d3b8a8a9e39aa587234c86a5a7fae51606bcd70d96e6f30e83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7061 10136 bytes

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