Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c142a111585f453…

MALICIOUS

PDF

53.6 KB Created: 2020-08-30 13:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e43c77b1880811e55f968637575f3772 SHA-1: a8ae191bdbae26dcadc0b156c5e0cd5fe75bad4c SHA-256: 5c142a111585f453c9e36036c9ea7dd6b6d051978d0aff90d749697ece8eac5e
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a malicious redirector, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. It also features a large number of external PDF links, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs supports a phishing or redirection attack pattern.

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=ya%2525C5%25259Fl%2525C4%2525B1+adam+ve+deniz+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_2a7ab4fa13ef4a3381c92a1aa9ddd512.pdf
    • https://static.usrfiles.com/ugd/b8c837_3fbf20b3a4684a5ba762c53a39b1ad9c.pdf
    • https://static.usrfiles.com/ugd/ae059d_5e24eb1fc62646a9981389e701ecb19f.pdf
    • https://static.usrfiles.com/ugd/87d215_5ea844715713464791c1ebc54dc4c144.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f6e0a5b89b14037a7c44b6d91043543.pdf
    • https://static.usrfiles.com/ugd/ae059d_499a3baf59564cc4938679dea591b7e5.pdf
    • https://static.usrfiles.com/ugd/9c0842_7e7166d23dcd4413abe12e9a05bd7a24.pdf
    • https://static.usrfiles.com/ugd/b8c837_72ac287dc92f407fb616400383bbedd3.pdf
    • https://static.usrfiles.com/ugd/b8c837_56c0b4bed7f74b5cb74e8850294d410d.pdf
    • https://static.usrfiles.com/ugd/dc8a8e_d9173ad3f31c41c4a505e6ab3af79544.pdf
    • https://static.usrfiles.com/ugd/de3d83_5abb8288f5cf4884b17bea6c699c70a7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072d9.bin
54f4f5dc07f38dfff8bf60986758dd394d5720caee452d24c7e7089023af9bd5
pdf-font-stream PDF embedded font (sfnt) at offset 0x72D9 5264 bytes
font_01_sfnt_off000084bf.bin
94774550c47dcadd25912beb5392437b0afbdab1a60aa0046a785336816e3491
pdf-font-stream PDF embedded font (sfnt) at offset 0x84BF 15280 bytes
font_02_sfnt_off0000b2af.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AF 16204 bytes