Malicious PDF — malware analysis report

Static analysis result for SHA-256 76753fb1863d5319…

MALICIOUS

PDF

54.3 KB Created: 2020-08-31 00:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4da3d0dc8fd0e13b88f69512b4d67489 SHA-1: 1b69acc2e4deed93a9ea49d8e62f0d777b6fe4f8 SHA-256: 76753fb1863d531999075cdc7771e4b1f391444fb525061b74c5950fc19132fe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains text that suggests it is masquerading as a study guide. The primary malicious URL identified is ttraff.ru, which is flagged as a redirector. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=cissp+official+study+guide+8th+edition
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_ef6a5554ca4744a995576b1ca1b073ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad786e8db1894112b68a834a17b14b18.pdf
    • https://static.usrfiles.com/ugd/16a96a_287e91569a93498aaa71388a74d0d356.pdf
    • https://static.usrfiles.com/ugd/b8c837_8fb9c67ba5c34197bdd12f7c1116f610.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1a4742eb5d045ea850a6c93b6a45d7b.pdf
    • https://static.usrfiles.com/ugd/efb3f0_25edbfa879084599819b842cc50264b8.pdf
    • https://static.usrfiles.com/ugd/eed56f_534ad69850254595ab63382871c17142.pdf
    • https://static.usrfiles.com/ugd/b8c837_453b49a91bbe4ca78793cb8de7d4e7ab.pdf
    • https://static.usrfiles.com/ugd/22bf55_b42c86fdda8a48609ae81297ab59eb4e.pdf
    • https://static.usrfiles.com/ugd/7041e4_199d5325d3464698aa8409592c21c945.pdf
    • https://static.usrfiles.com/ugd/0dcf4b_a2158f5ff47b4fc1a77f3c0e53f7d671.pdf
    • https://static.usrfiles.com/ugd/04e6f9_e835e3d75ff94373a767946f4076b5e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_d8acc7fd0d7a489980e701c559c69d7f.pdf
    • https://static.usrfiles.com/ugd/1a89c8_6228230a8d22498eba2aa4d529f6ad61.pdf
    • https://static.usrfiles.com/ugd/10b11f_08973d10931240c5948b82be1e20abb8.pdf
    • https://static.usrfiles.com/ugd/0789d5_0dde53f195a54bbb949314cad7b717e8.pdf
    • https://static.usrfiles.com/ugd/b8c837_de1879afb99948e58721224126c2868c.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008602.bin
6a7512ee66d8e51763b7c2e7154028d489546044264ba22a554420c482b0c65a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8602 5524 bytes
font_01_sfnt_off000098cd.bin
8efd7405ea1948e7e75df98edf686e63b5fc2b3471b982903e9a6d39a907e28a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98CD 11300 bytes
font_02_sfnt_off0000be19.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE19 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.