Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6dfa05daee41519…

MALICIOUS

PDF

38.5 KB Created: 2020-09-02 21:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9b383fbeee01ae7db3eaecdda2ec2d2 SHA-1: 1dd455ac9a316f27b935bd1471c6179609393416 SHA-256: f6dfa05daee415191e53c8dd52280912d10c64e3b49aa0879bcb7b8e06bb2957
154 Risk Score

Malware Insights

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

The PDF document was flagged by a critical heuristic for containing a malicious redirector link. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources. The primary malicious URL identified is https://ttraff.cc/wix?keyword=arabisch+deutsch+visuelles+w%25C3%25B6rterbuch, which likely serves as a gateway to further malicious content. The document body, though heavily garbled, contains references to this URL and other PDF files hosted on static.usrfiles.com, reinforcing the link farm observation.

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.cc/wix?keyword=arabisch+deutsch+visuelles+w%25C3%25B6rterbuch
    • https://static.usrfiles.com/ugd/9374a7_cab71e7f534949b093aa965303ed366b.pdf
    • https://static.usrfiles.com/ugd/c3548c_e5a6da37d9dc4cbd9edf2fe95937e902.pdf
    • https://static.usrfiles.com/ugd/f1780b_ff43a92250b248eb9d2241e9a24b552e.pdf
    • https://static.usrfiles.com/ugd/8ade13_b6dd71bcad304de9969e4e5ac19315f9.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_f96e7e04a76d4f0da2ab9b2780dee928.pdf
    • https://static.usrfiles.com/ugd/b65acf_21646ac67e424a7697bee926670651bd.pdf
    • https://static.usrfiles.com/ugd/455f95_5813c76b465d4c43b4d265bd1bc0141f.pdf
    • https://static.usrfiles.com/ugd/3ce946_58f0722decd9419dab0de34466514f3d.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a42262263df4cbd8bf878a3eda5f33c.pdf
    • https://cdn.shopify.com/s/files/1/0434/0498/4483/files/conclusion_for_hotel_internship_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/9372/1255/files/warhammer_40k_codexs.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/wuwebopijunilar.pdf
    • https://static.usrfiles.com/ugd/b8c837_3776a5ddc8e743ee883cc026ff267536.pdf
    • https://static.usrfiles.com/ugd/a86d68_e6b78d7692624d0883c4ee7d56576aa8.pdf
    • https://static.usrfiles.com/ugd/8b4172_a6a500298c4a4f63bab52d2dbc0413f7.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_off00004881.bin
9e4a80dec13c4c4ed8aeda837a39eb72d8d9278e2636d954c3c171da3f909489		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4881 5112 bytes
font_01_sfnt_off00005a02.bin
38c1fca10e6297e944c2fe90c9738189798b63640fbeb0dbf936e592a2b99a18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A02 10568 bytes
font_02_sfnt_off00007ce7.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE7 4324 bytes

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