Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c082901344e0be…

MALICIOUS

PDF

47.2 KB Created: 2020-09-20 05:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00ef907f323892e16c6a4ee88a0c4947 SHA-1: afd30410c986923f3c6b32b7fd7ca848c647bdf0 SHA-256: 83c082901344e0beb2b8bae1e4c79f1539771475a2e46240c9d32a8fab124440
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to disposable domains and redirector infrastructure, indicating a link farm designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of links to known malicious redirectors further supports this assessment. The document's purpose appears to be to lure users into clicking these links, likely leading to further malicious downloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=algebraic+proofs+in+geometry+worksheet
    • http://files.dreamility.com/uploads/1/3/1/4/131406811/zigosaremiv.pdf
    • http://files.lordofmath.com/uploads/1/3/1/1/131164431/5693d13b3341a3.pdf
    • http://logoz.kaufman-law.com/uploads/1/3/1/0/131069910/454bf643c00.pdf
    • http://files.nyabuoy.com/uploads/1/3/1/3/131381078/1657006.pdf
    • http://tagaw.citytourstravel.com/uploads/1/3/1/8/131856970/3399944.pdf
    • http://fowox.marychabre.com/uploads/1/3/2/3/132303181/4657953.pdf
    • http://files.brissaeden.com/uploads/1/3/0/7/130739376/4209e3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://70a72690-75f2-4237-b152-79289739bcf8.filesusr.com/ugd/97634b_b88c54db191847ce8b8acad4c9b299ff.pdf?index=true
    • https://e4be94bd-1f1c-4b5b-a5b5-033885bdaf61.filesusr.com/ugd/c8683e_bf8622bdd52d4f2196f3749e22cece0f.pdf?index=true
    • https://d11394e3-fe12-4582-9c75-c0075e788722.filesusr.com/ugd/8127dd_1a9f1edd85be4935842eb9133a2e7a0b.pdf?index=true
    • https://279020fc-ff99-4dda-ae4b-761ffa9328f3.filesusr.com/ugd/6116da_1983165d8a7943ec95116d9689d23863.pdf?index=true
    • https://680095a0-306a-4176-9437-08e20e2f7775.filesusr.com/ugd/1d64af_006f98418cfb40eabf686d310ab220dc.pdf?index=true
    • https://31ba992c-4c4a-4478-a693-72d1c4d66d0e.filesusr.com/ugd/debbe1_17a31e2e38d3472ba84c9382c3e9a952.pdf?index=true
    • 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_off000063ec.bin
6c1dfedef5323e34eec591b797a587a3aaa3e9307f8516980187c7e8aaa7919d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63EC 5816 bytes
font_01_sfnt_off000077af.bin
684493d92e8822c919c61056c90295775cd12c90bd0c06b40c020e5ca9e10ab9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77AF 10060 bytes
font_02_sfnt_off00009a6d.bin
6c0b0f56775aa1e9282092c5f2e789b1388090d701bae0c95087b1e0034ad40a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A6D 16208 bytes

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