Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9662883191a29fa…

MALICIOUS

PDF

38.6 KB Created: 2020-09-03 05:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9215dd938792e272a72a8bfea4a25d0 SHA-1: 0bf56ff36ca2435dd61318472e621c278b3ff295 SHA-256: c9662883191a29fae902140d0e3a3816602993e20e245467bfdb7ca0b215fe20
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=marines+hymn+sheet+music'. This URL is likely used to redirect the user to a malicious site. The document also contains a large number of embedded links, many of which point to Shopify domains, suggesting a link farm or SEO manipulation tactic to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.club/wix?keyword=marines+hymn+sheet+music
    • https://cdn.shopify.com/s/files/1/0431/5450/5882/files/jedefagamugisom.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78108387577.pdf
    • https://cdn.shopify.com/s/files/1/0430/1720/7971/files/bal_krishna_photos_hd.pdf
    • https://cdn.shopify.com/s/files/1/0451/9346/1909/files/ecg_rhythm.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/wiviziluduwisufapujuzo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8466/1407/files/aiou_date_sheet_ba_spring.pdf
    • https://cdn.shopify.com/s/files/1/0433/4118/5189/files/rebanibumolol.pdf
    • https://static.usrfiles.com/ugd/b8c837_e2a383a491994bdb800dbf6807dcff9c.pdf
    • https://static.usrfiles.com/ugd/8e1900_a320b83136634acfb3bb0fee62afae94.pdf
    • https://static.usrfiles.com/ugd/2c608b_2e6734e4f4ec4d88a669ee4f2eaea401.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e9cc5ab94c448da854a1bd4eeb2081d.pdf
    • https://static.usrfiles.com/ugd/91e123_bf4767e4a7b7463f902222a5b483187a.pdf
    • https://static.usrfiles.com/ugd/46429b_84e8551b82e5422da1acca11efb553e3.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_off00005a65.bin
5c51603658b087e5830934f5d693c128a90742ad89087ea9eb45e1ff23067c0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A65 5112 bytes
font_01_sfnt_off00006bb0.bin
0d2a241e5d7b4215bbe7c7bd5cdbe3cdee537ef86d7e8e4a1d67ae1ef0d0ca3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB0 10088 bytes

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