Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0bc3ff458098e3…

MALICIOUS

PDF

44.0 KB Created: 2020-08-30 21:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f429368ab1bff42c7e5fa503cf035f3d SHA-1: cb7cc42800f8ad7e16cd3d3388f25859258d31ed SHA-256: bf0bc3ff458098e3b5be7ce821c1a40ad8655c2411e69a11f275696c71e2b402
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com, and one critical link to a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, contains the target URL, suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness.

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.com/wix?keyword=electrodynamics+griffiths+4th+editio
    • https://cdn.shopify.com/s/files/1/0438/2212/1122/files/38330765154.pdf
    • https://cdn.shopify.com/s/files/1/0440/3062/3894/files/bilekoburaramonamafuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/8525/1235/files/86495883777.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5822/files/emerald_tablet_text.pdf
    • https://static.usrfiles.com/ugd/834936_136453293d5b4aad89a2ab0ed4f33706.pdf
    • https://static.usrfiles.com/ugd/5438e3_f282ea79500f4360b8ad33cd0c6e35f6.pdf
    • https://static.usrfiles.com/ugd/cdb50c_41171c303f874c758a87c026f9bb4939.pdf
    • https://static.usrfiles.com/ugd/136d07_3da987c7d2d1447a819a4c743d682624.pdf
    • https://static.usrfiles.com/ugd/b8c837_b11fb9b6e82542b783bc017fea5d10af.pdf
    • https://static.usrfiles.com/ugd/0d2908_b6b595dc4e89473e89e55d61308c6e62.pdf
    • https://static.usrfiles.com/ugd/b8c837_0564db30819642d980ce7fa014338bad.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f949fd4c32245dea35cfdcd393a6c3a.pdf
    • https://static.usrfiles.com/ugd/b8c837_7308ee4b571447b4aa1357ab9ffdc422.pdf
    • https://static.usrfiles.com/ugd/a1fb72_929bb37c2cb94496ae5430524abb626e.pdf
    • https://static.usrfiles.com/ugd/e42ee3_3b5d1ac2f0ea4758882c2c5eaebde9af.pdf
    • https://static.usrfiles.com/ugd/76b6de_db3424980fb94e1abad287b528315ec2.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000602f.bin
dadbb5ab3b8f269eea7ddfedc750af1b4f1ac158a4901eacfedc5d80e0f677ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x602F 5372 bytes
font_01_sfnt_off00007248.bin
d3bf68769fa969a78661f41f83bf8f72d840f975d313e024c1eb6e7d595f789f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7248 10068 bytes
font_02_sfnt_off000094b4.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94B4 4324 bytes

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