Malicious PDF — malware analysis report

Static analysis result for SHA-256 8941f18878c0e760…

MALICIOUS

PDF

68.4 KB Created: 2020-08-30 21:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 854253d0434eb6a196743175115944c3 SHA-1: ee1e039a50e0682e3aabefa60a893d6a39623594 SHA-256: 8941f18878c0e7605d848347ce913cbdb66a61cbd8af91993d48e46472c886f3
162 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to a 'rental application form'. The presence of numerous external PDF links, many pointing to benign content, indicates a potential link farm or SEO manipulation tactic to obscure the malicious redirector. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=basic+rental+application+form+ohio
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/963627_bf894a3992f14304a45fd599a7b31d08.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f8ed2b1abe54ebb89ad6e7405b5138e.pdf
    • https://static.usrfiles.com/ugd/bb13a2_4aae228b521345619cb5d4d1fe45bc26.pdf
    • https://static.usrfiles.com/ugd/c1615c_20ac03d6fe404a94bd005126da43e215.pdf
    • https://static.usrfiles.com/ugd/b8c837_883c4b7ccc9a43698a4e73b2dc099854.pdf
    • https://static.usrfiles.com/ugd/b8c837_012c1a48c59c4d30b027a1d7a6c9ffdf.pdf
    • https://static.usrfiles.com/ugd/3b47cb_334293350eb34b0d8265cb3a0efb6f17.pdf
    • https://static.usrfiles.com/ugd/b8c837_45f32cf3ec2948f5b6d9871cdedec016.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f537d568060488083cfdf7324a94cd4.pdf
    • https://static.usrfiles.com/ugd/b8c837_59240b87a2df4a82886d87d09c4257d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_b6ade1eebc8242aba3474f90d177a413.pdf
    • https://static.usrfiles.com/ugd/b8c837_6aecdae74ae14960af658b92618a68f8.pdf
    • https://static.usrfiles.com/ugd/52b593_302b7ab815ff43618d197fabc403a607.pdf
    • https://static.usrfiles.com/ugd/d54300_4e1cd4cbaed1467b95a0a0e506ebcf4f.pdf
    • https://static.usrfiles.com/ugd/be19e1_a1f1e282ac154f4984232b2ba0066eda.pdf
    • https://static.usrfiles.com/ugd/b8c837_0893b9117fc24951aa6f7b0ce4139260.pdf
    • https://static.usrfiles.com/ugd/b8c837_f21874f4e02c488e9fd7f7abb3329ddd.pdf
    • https://static.usrfiles.com/ugd/fac845_3c8afea8c29c497f95ee9ec2707c1c34.pdf
    • https://static.usrfiles.com/ugd/575363_9e32c811dca8443e85c55cd7e7059af8.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c041.bin
62610eb278e9e9949d1367cbf189b43ee57ac49fb3796cc8c0d6bd161139b15c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC041 5092 bytes
font_01_sfnt_off0000d14b.bin
d0d1a91481f0327705a3b9b72a1322664edf054ed3ccefb4caeaa0772bd19073		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD14B 10724 bytes
font_02_sfnt_off0000f5b6.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B6 4324 bytes

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