Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a6199a4879ec38…

MALICIOUS

PDF

44.0 KB Created: 2020-08-30 09:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 027085413a773544fac91d37cfb15c47 SHA-1: 4b2bb5a1caa00b83513502d6d9b89c5dc5d9289c SHA-256: a7a6199a4879ec387d55d826821c375a155a0bc3e1a7800168886edf81bb0466
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to a malicious site. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive 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/wix?keyword=dr.+berg%2527+s+new+body+type+guide
    • https://static.usrfiles.com/ugd/a01749_8c95d776c50d4cd09f4400254708a6c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0aabbc553d042b99877955f06c725cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_311c22bcd3a346988ed7ac3f2868541d.pdf
    • https://static.usrfiles.com/ugd/804ff6_d0b31c3f306c495096b0794be26224eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_a905ced1868b4c9397f96f1750eac592.pdf
    • https://static.usrfiles.com/ugd/b8c837_713cf3315c39486a8fafe1f340c7bd80.pdf
    • https://static.usrfiles.com/ugd/3cb679_47ef0e18e5874c7991f25a94c3327538.pdf
    • https://static.usrfiles.com/ugd/b8c837_39e6caa1872b43a28dbce8683b806f40.pdf
    • https://static.usrfiles.com/ugd/7d1dc9_08a6fe0b0094459ba1f6003c250ea617.pdf
    • https://static.usrfiles.com/ugd/6290de_7def4cf10ac445368c133531eca64dc4.pdf
    • https://static.usrfiles.com/ugd/b11f6d_1bee1c16dc6e40ed8982075d5438074e.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a9f8d3306244c11988bdb7009189749.pdf
    • https://static.usrfiles.com/ugd/b8c837_d81b9089030945d886ddd7c35c0b34d2.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_off00006c08.bin
7699414f3fe3c4addf7449923ffbb0571b7ec2af11722324460fae156e5be4bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C08 5284 bytes
font_01_sfnt_off00007e30.bin
cc8e2d6c046f7db9deb36362c5fc5bddc4187229ec896cb47fc33653483fc5f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E30 10808 bytes

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