Malicious PDF — malware analysis report

Static analysis result for SHA-256 8768bf4c4c555035…

MALICIOUS

PDF

44.3 KB Created: 2020-08-30 13:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b1e37b0b7a306741d1c92d1a39fcf86 SHA-1: e6e11f55a9dcfa9602fe875bcc3bb8175b02060c SHA-256: 8768bf4c4c555035c05eba88e6eacfee6e005ce3785c7dd38cd08e9f5a38f510
152 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. One of these URLs, https://ttraff.ru/wix?keyword=hogwarts+letter+pdf, is identified as a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The presence of a link farm and a malicious redirector suggests an attempt to lure users to malicious sites, likely for phishing or malware delivery.

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=hogwarts+letter+pdf
    • https://static.usrfiles.com/ugd/b8c837_7f1c85de66dd4687b694c5f26e3a0ccd.pdf
    • https://static.usrfiles.com/ugd/576447_401eaab38b3641a489a4818834df662e.pdf
    • https://static.usrfiles.com/ugd/b8c837_449531be947f4abbbab4ac6ba5463b66.pdf
    • https://static.usrfiles.com/ugd/3e9e83_5baecebb0f254c5cbb1d48dfb7a3de97.pdf
    • https://static.usrfiles.com/ugd/b8c837_6269df8c38474704b9020af4bb0b4d61.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b556fd772c44d8b82230052d94cc704.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_b9593068bced48c382c6c76520151976.pdf
    • https://static.usrfiles.com/ugd/b8c837_71ee7a45dfad423e9b5932f2d52fef28.pdf
    • https://static.usrfiles.com/ugd/b8c837_bbe3e27c4de042d8b924d2f59be0f480.pdf
    • https://static.usrfiles.com/ugd/b8c837_f101c65fa2fe4cafa78c193f6aab79a0.pdf
    • https://static.usrfiles.com/ugd/bdeb4c_c614d1a396d14e898923ed930776cd7c.pdf
    • https://static.usrfiles.com/ugd/76b6de_64d716a5929c431ebcce4041424d8cb3.pdf
    • https://static.usrfiles.com/ugd/b8c837_5769e1b7c6f04deabef1f2ef0e60a801.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_549ec7bc1a8c46d7a7658c6f082be48c.pdf
    • https://static.usrfiles.com/ugd/a771bd_a21cb47d356b459abd7059835413888c.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006224.bin
7e42914ac21013194e6083dac7debf7df8e2baf00e1e12c21318b3dd3e07f2a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6224 4896 bytes
font_01_sfnt_off000072f6.bin
8871f3540fdd8fff424172d0d3cb1766e22cd8648b3cc0ec5d99c00954d41a38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72F6 10688 bytes
font_02_sfnt_off0000966f.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x966F 4324 bytes

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