Malicious PDF — malware analysis report

Static analysis result for SHA-256 106892e5cfd30134…

MALICIOUS

PDF

49.4 KB Created: 2020-09-04 12:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23cd561f8ab25fc9545abff5a4db1750 SHA-1: 10645979a2c2e426e0db486293e25bf8eef06992 SHA-256: 106892e5cfd3013427e536067b303b9fb4913aba31cd783fe0b158813b4568c7
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful content.

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.link/pify?keyword=calendar+2019+pdf+kalnirnay
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://static.usrfiles.com/ugd/f515ca_165fc182b791464788d17c5a7960b6e3.pdf
    • https://static.usrfiles.com/ugd/ace02d_10545f3e4e644614b2a889675b2bcc1a.pdf
    • https://static.usrfiles.com/ugd/30e015_98d7b4388f824e59b0d9333f8e39c5a5.pdf
    • https://static.usrfiles.com/ugd/1cc7e8_7695e17d2a6d47d6a5305fa575e27415.pdf
    • https://static.usrfiles.com/ugd/e78b77_fe829bb2d31b4b4f9d4a95ea90b6c0f7.pdf
    • https://static.usrfiles.com/ugd/3eed2b_083f2a67a55e46fa983bbeb23b6f6ce5.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_53b999e3d88e48ec92743e7c8e8c915d.pdf
    • https://static.usrfiles.com/ugd/02beb7_e10db94649ca40b4bc0d6154519a2267.pdf
    • https://static.usrfiles.com/ugd/d5415a_938a83b2c7c2436dbe7db585e207d10c.pdf
    • https://static.usrfiles.com/ugd/15d534_5485e5984bc84f36847423e0691d4e5c.pdf
    • https://static.usrfiles.com/ugd/4c1554_3135df0e847245d2a8e878d6a17747f9.pdf
    • https://cdn.shopify.com/s/files/1/0440/2964/0854/files/69987107819.pdf
    • https://cdn.shopify.com/s/files/1/0439/1777/0904/files/13480778634.pdf
    • https://cdn.shopify.com/s/files/1/0430/8320/2711/files/phn_mm_audacity_full_crack.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a7c.bin
98af8bd70029c19b9ef3d27329f3773b8cc19880ea050b1b8cf2635dbe364960		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A7C 5408 bytes
font_01_sfnt_off00006cfc.bin
f69611edbe595cdfbaf8a2b9380abd7905e8bb293a33b5214c02d335dc4cfa8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CFC 10392 bytes
font_02_sfnt_off00009046.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9046 16164 bytes
font_03_sfnt_off0000a59b.bin
a0237da2ba6f7d0b862c21bbba5b6eb9f46d0a62d33dbf6d93c3da7886ced467		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA59B 5112 bytes

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