Malicious PDF — malware analysis report

Static analysis result for SHA-256 c712552fdfa3c2ed…

MALICIOUS

PDF

35.3 KB Created: 2020-09-17 23:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a9620ebd7fbb1111cfa56bc6220d66a SHA-1: 3b2029e5cbc3f1ecd22f28b7fca46b15ea8a5c02 SHA-256: c712552fdfa3c2ed6d773938e854e7653cbd0fb89e59d9d8b1312ec6218731d2
250 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous invisible and malicious redirector links, as indicated by the PDF_REPEATED_PAYLOAD_LINK_LURE and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The primary lure appears to be related to 'live me unlimited coins hack tools.com'. The document body also contains this URL and other PDF links, suggesting a link farm strategy to improve search engine ranking for malicious content. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • Invisible/repeated PDF links deliver payload file critical PDF_REPEATED_PAYLOAD_LINK_LURE
    PDF uses invisible link annotations and points to a direct payload download. Repeated invisible links or lure-like payload names such as document/unlock/verify archives match malware-delivery PDF carriers where the page is only a prompt and the real payload is fetched from the linked URL.
  • 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.
  • Clickable PDF combines external action with parser-evasion structure high PDF_ACTION_PARSER_EVASION
    PDF has an external clickable URI together with object graph or xref structures that make parsers disagree, such as divergent duplicate objects, parser divergence, or xref offset mismatch. That combination is stronger than a plain link: the document is both an outward-action carrier and a parser-confusion/evasion sample.
  • 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.me/wix?keyword=live+me+unlimited+coins+hack+tools.com
    • http://bunila.mbcnavarino.org/uploads/1/3/1/8/131856158/jodafobaxad_vazakamusonu_tagope_wowaparenexi.pdf
    • http://files.csnobcs.org/uploads/1/3/1/4/131452806/c9c3257b.pdf
    • http://files.cmztech.net/uploads/1/3/1/6/131637014/rematupoki.pdf
    • http://files.pocketsbydesign.com/uploads/1/3/0/7/130775747/5444292.pdf
    • http://files.carolyncardinet.com/uploads/1/3/1/8/131860204/1338404.pdf
    • https://2b11ca0b-a654-45cf-9a4f-1a5a7a0aaad4.filesusr.com/ugd/6cf0f5_e644451e76654500b05ae9d65dc6a05e.pdf?index=true
    • https://38b4dc07-8bd4-423a-b472-55387772980b.filesusr.com/ugd/e23fbb_5f86c9b261c04ef0a518878548373582.pdf?index=true
    • https://2e949d7b-01b0-40dc-bc89-745911a72fdd.filesusr.com/ugd/a2e20a_03c262449f2748e092cbf60871784b24.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94430640368.pdf
    • https://cdn.shopify.com/s/files/1/0435/5624/1557/files/nuninajibuxekusudezidama.pdf
    • https://06958dbc-9544-4fdb-b1f3-4130c747a00b.filesusr.com/ugd/9bd82e_1bda630a9ad9486991f47fe3b65995ac.pdf?index=true
    • https://7d10402e-b19a-48eb-8de3-a14d58615126.filesusr.com/ugd/0a052f_ce24ec36491d431d88f842faf905fea8.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d41.bin
b45ef7ca66331d1b3507002d4800a7beacb093329a723c76736f717f19f806e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D41 5180 bytes
font_01_sfnt_off00005ec5.bin
f1435912f41a47313531f82efdd4569fa1c784e752b43781f647c3ea2575e7bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC5 9900 bytes

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