Malicious PDF — malware analysis report

Static analysis result for SHA-256 633ab37982cba3dd…

MALICIOUS

PDF

51.3 KB Created: 2020-08-29 13:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a238343ffe55f51016b057b5f3750e9 SHA-1: fe0d894602bc16fea427e191b4e92e28b38cfeaf SHA-256: 633ab37982cba3dd15d50c15497bf9c5a679385e11456e5e6f83b70f4404d20a
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one prominently pointing to a known malicious redirector. The document body, though heavily obfuscated, includes text related to a firearm and the malicious URL, suggesting a lure for a phishing or scam operation. 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=taran+tactical+glock+34+john+wick
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_8793cd0b0baf4a898d1e1cca203a6f7e.pdf
    • https://static.usrfiles.com/ugd/b8c837_1090561acb51407e9a75fb0299b9f7d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_50abd8b790994076b78129ad15265376.pdf
    • https://static.usrfiles.com/ugd/b8c837_56dd455462e7419abe3af69b4c9d6f31.pdf
    • https://static.usrfiles.com/ugd/b8c837_6269df8c38474704b9020af4bb0b4d61.pdf
    • https://cdn.shopify.com/s/files/1/0427/9658/1020/files/wowonokero.pdf
    • https://static.usrfiles.com/ugd/b8c837_7492fa46f0884664b73071ecbe1ce725.pdf
    • https://static.usrfiles.com/ugd/b8c837_30ce5847282146c2aa74d1ee1e08ce86.pdf
    • https://cdn.shopify.com/s/files/1/0428/9753/9231/files/35517048982.pdf
    • https://cdn.shopify.com/s/files/1/0431/4444/6118/files/togijebowezidon.pdf
    • https://cdn.shopify.com/s/files/1/0432/4373/3154/files/screen_video_recorder_app_android.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000667d.bin
a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x667D 6440 bytes
font_01_sfnt_off00007671.bin
cc1da9aa32239cb29ba17da6dae6319bbc0800721714cc2969bc9cd1041ba81a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7671 5316 bytes
font_02_sfnt_off00008898.bin
28f976a0ff22b5a969191b5b06e011fb098e8bf9185b1ae42652dac4cd3532f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8898 10120 bytes
font_03_sfnt_off0000ab76.bin
9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB76 16036 bytes

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