Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ef23878a7cf8e4…

MALICIOUS

PDF

41.6 KB Created: 2020-08-26 09:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b13e37a33ac6b1421d526fa33e5053d2 SHA-1: f6b9708e26960a8ef32c26fb2d37f57e4a4b4507 SHA-256: a1ef23878a7cf8e48d59d82e8d1c7b7e7bd3eebae8f479894f2cadf7861475d4
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, which is also present in the document body. This link, 'https://ttraff.me/pify?keyword=pitch+perfect+song+download', is designed to redirect users to malicious content. The document also exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to Shopify domains, likely for SEO manipulation or to host further malicious content. The ML classifier 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.me/pify?keyword=pitch+perfect+song+download
    • http://files.waysidechristianmission.org/uploads/1/3/1/3/131380728/ranemepumuxaxabuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/3756/4839/files/57243037428.pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8910/files/fipiwibapokenititakeze.pdf
    • https://cdn.shopify.com/s/files/1/0433/6615/4394/files/hebrew_and_greek_bible_dictionary_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/5442/2423/files/fowivufiperelegoporan.pdf
    • https://cdn.shopify.com/s/files/1/0433/2313/0009/files/56509791556.pdf
    • https://cdn.shopify.com/s/files/1/0436/9498/1273/files/store_keeper_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20745245188.pdf
    • https://cdn.shopify.com/s/files/1/0431/1692/0996/files/66755888756.pdf
    • https://cdn.shopify.com/s/files/1/0436/9219/5993/files/hydrotherapy_exercises_for_low_back_pain.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_off00006376.bin
1987fe749955fe54273ae881d2cc599f7f6c0de472fd41acb06ef4c40d770338		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6376 5508 bytes
font_01_sfnt_off00007639.bin
4a443e13619a7f3047fb8c02406b58cf0c9622f41169139b1464e9ea44a45c13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7639 10292 bytes

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