Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e1e1701b32d9444…

MALICIOUS

PDF

34.1 KB Created: 2020-09-01 21:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 186a98c17a62f6d82f07272c7de70fbc SHA-1: 2f7818785e8921fdf58c619fa4a3db291685a7c5 SHA-256: 9e1e1701b32d944417023ce62f1ae772e50fe3b2e13eb7ac10e11bd2b61bc349
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for 'Archicad 18 tutorial pdf'. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

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.link/wix?keyword=archicad+18+tutorial+pdf
    • https://static.usrfiles.com/ugd/71fd01_ad1bc604b1874840ab91ae4168e78911.pdf
    • https://static.usrfiles.com/ugd/8cbfce_1eec04dff14b4a88907bd73ce4d55032.pdf
    • https://static.usrfiles.com/ugd/b8c837_d42d25c9b49e4e99b857bf4018648e8b.pdf
    • https://static.usrfiles.com/ugd/b8c837_41934b2beee5442ca25610b90fd6c930.pdf
    • https://static.usrfiles.com/ugd/ce0e6d_f1cc5120a98641208313bed1f366e8ed.pdf
    • https://static.usrfiles.com/ugd/405339_70c14202aeb94ccca92a20d6e4dbcbcf.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f497ba781d34cb5a5cacf40d1b91d67.pdf
    • https://static.usrfiles.com/ugd/e1c37d_d72e7f2e778e444faeb3cc4d04e97c3c.pdf
    • https://static.usrfiles.com/ugd/b8c837_2834814971b8414ca577aa28b115deb1.pdf
    • https://static.usrfiles.com/ugd/bf07b1_725086f1af6147a3b88cb355d525a4d9.pdf
    • https://static.usrfiles.com/ugd/19ce5d_42749ab8215f401a8c67fc9de7fad4bb.pdf
    • https://static.usrfiles.com/ugd/b8c837_f602e6d0c98f4ab48961cb3c154c89d3.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_off0000485e.bin
c466283ef0bb0e3dc55f554a9762f9c7b40d511ada7c22f8bc1e188dfc3bf819		 pdf-font-stream PDF embedded font (sfnt) at offset 0x485E 5300 bytes
font_01_sfnt_off00005a66.bin
b677136765add4f70e0bedacb4d8ed107af8ffcb1d0687a3790370ba08579c72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A66 9960 bytes

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