Malicious PDF — malware analysis report

Static analysis result for SHA-256 040dc9fe63b55ef9…

MALICIOUS

PDF

66.5 KB Created: 2020-09-01 03:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de09a5dc9a850029fc46b864a3f1a5e7 SHA-1: 4be60ee1bfbf99a9d7d2b140e3cf86ce33972148 SHA-256: 040dc9fe63b55ef96e459db85c01906f8508df609d9475941b7a4b70b23ce249
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be directing users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.com/wix?keyword=sharechat+love+birds+images
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://static.usrfiles.com/ugd/b8c837_ed2bcaf1ba7d400998efd749d792b133.pdf
    • https://static.usrfiles.com/ugd/b8c837_9631e454f8c64eb89350741a13eb1129.pdf
    • https://static.usrfiles.com/ugd/05900a_c6934f7aaee64858850837957ecc2189.pdf
    • https://static.usrfiles.com/ugd/accd1f_c783051269244cba8c86e6cb0423cea9.pdf
    • https://static.usrfiles.com/ugd/b6edda_2d9a68048a834b97a64cb774c735378a.pdf
    • https://static.usrfiles.com/ugd/b8c837_69eacfa2fd24478ab8177c7c07243d6e.pdf
    • https://static.usrfiles.com/ugd/8b49c6_e90e86435f8048828769fd9f7dd0560f.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb1a0a638dc54fd3ba8de776b10e02fc.pdf
    • https://static.usrfiles.com/ugd/d4579c_1fe7a53fe5f942f98e61882553eedaca.pdf
    • https://static.usrfiles.com/ugd/b8c837_ea853b393fef4fabb0aa58f16eb44639.pdf
    • https://static.usrfiles.com/ugd/f65175_93439b1feda940ba88dc501daf119bf6.pdf
    • https://static.usrfiles.com/ugd/74a852_8f9722e6047541a6b4e1ac1092075813.pdf
    • https://static.usrfiles.com/ugd/9c0842_2533f510b36541e58ceb1b9072fc68b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c4e3d1d74f947e1ae4d67666191a89f.pdf
    • https://static.usrfiles.com/ugd/3615fb_05935e706ce742b9a72f7fc977b462c3.pdf
    • https://static.usrfiles.com/ugd/5926b4_e6da48cd124c40c38699fc2d35af1d83.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a07edf9d9f64c18bb50311f113be05c.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005058.bin
a4f822593919779aa7bef804d6d7a940ee2115c3ed9882a5bef65a310bebbdfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5058 5656 bytes
font_01_sfnt_off0000636d.bin
52b1dfe610328eaf0de9b56a5ca5861fd25d63765b4d45ebde76786ff945ee81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x636D 5068 bytes
font_02_sfnt_off00007452.bin
c571957484068fca439a6f2a4f37c966d99ed8b54d20cfa83146799c9bdb0bc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7452 4988 bytes
font_03_sfnt_off000085cf.bin
3ff439083c601e6c805b06837c48c8d29b758d364e3b358f21d29ad797eec936		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85CF 10812 bytes
font_04_sfnt_off0000a78f.bin
de39a8e910e6421868aa096a0c68ead4107a9311d382ff547535197cfdaf0f65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA78F 13056 bytes
font_05_sfnt_off0000d09a.bin
f2e967a0dcb582cc165b4165953a8c441eec1d258b8070e43e589a8d410c02d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD09A 17348 bytes
font_06_sfnt_off0000e8bb.bin
e910d68b270e8b7f978109ff8c8b455cc1131cc32194d642dadb383556d7b8d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BB 4364 bytes

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