Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ceafc8edb476e91…

MALICIOUS

PDF

51.6 KB Created: 2020-09-02 10:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16ec6da960919b36cd044fe0b023ccf8 SHA-1: 9e6efdeb3df9cb81397b4ce241c56cfb4d1a644b SHA-256: 7ceafc8edb476e91560499c874e2129084f8e031cde03a24aa1166117d64dc8b
152 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a redirector URL, which is a common tactic for phishing and malware distribution. The document body, though heavily obfuscated, contains text suggesting a lure related to 'Bible dramatized audio free'. The ML classifier strongly indicates maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a link to known malicious infrastructure.

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/pify?keyword=bible+dramatized+audio+free
    • https://static.usrfiles.com/ugd/3be3a7_49ff1745d5c643bfb93b928648a9610e.pdf
    • https://static.usrfiles.com/ugd/fb5067_e52a134379264ae29579e2b91d152d46.pdf
    • https://static.usrfiles.com/ugd/d4a9d6_9569d7e1645a4e719272c3dc07af88ce.pdf
    • https://static.usrfiles.com/ugd/b8c837_3d4996c4c49c4289a8913bc5ffcd4555.pdf
    • https://static.usrfiles.com/ugd/08e331_2ca6ead4e26140bfb8ac13ab91d85c4c.pdf
    • https://static.usrfiles.com/ugd/67e251_9dae9c4382244e90968318bd6ef05578.pdf
    • https://static.usrfiles.com/ugd/c068f8_caedc8cf02b846ee887d812b08b45493.pdf
    • https://static.usrfiles.com/ugd/bf0735_c635f3b0700a46f48047cc6ef55bfc98.pdf
    • https://static.usrfiles.com/ugd/16a96a_64499f3b89f34d3d823a9ff0d50e723f.pdf
    • https://static.usrfiles.com/ugd/dad7b5_c5ec8e23008544d59d942d30ec45531f.pdf
    • https://static.usrfiles.com/ugd/b8c837_042db4c71278417f95a5e63d6f565598.pdf
    • https://static.usrfiles.com/ugd/628a76_2fecaecbb776415a84d4fad0dadff1bd.pdf
    • https://static.usrfiles.com/ugd/930050_3b0ff08a89fb4093a7f59e02ba2f9ff3.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f3cfe0583d54cd0b63d2ef6556a1ace.pdf
    • https://static.usrfiles.com/ugd/b8c837_f602e6d0c98f4ab48961cb3c154c89d3.pdf
    • https://static.usrfiles.com/ugd/33c377_71e9d03ad779430e9c31f493f8373451.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c7aff14c8334b51b7656076802bf0d4.pdf
    • https://static.usrfiles.com/ugd/c7ef1a_fd22271e05b74d71aad8a0eecf0d742d.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008c34.bin
21cd9009bb28b2cc85de4df8f66197650df5382587589833fd5c708f3dec5c66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C34 5116 bytes
font_01_sfnt_off00009d8c.bin
d6bbe9367a7a14fd20339c9a1b31428f8d6ad7029a053d0054aa3b4c45cc9c91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D8C 10588 bytes

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