Malicious PDF — malware analysis report

Static analysis result for SHA-256 399676e264e618da…

MALICIOUS

PDF

43.9 KB Created: 2020-08-25 07:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84f6aefa4c4ad5a2ad2afc6e8e3496ff SHA-1: 4ef7a4b139d3cfde2d341884bcae1c45fbf3921a SHA-256: 399676e264e618dabc30c0c7c862d4e75564fa503502220e8ad4a5cd6bdedc49
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.ru/pify?keyword=math+shapes+for+kindergarten+worksheets, which is flagged as a malicious redirector. The document body, though partially corrupted, contains references to this URL and other PDF links, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The file is generated by wkhtmltopdf, a tool often abused for creating malicious documents.

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.ru/pify?keyword=math+shapes+for+kindergarten+worksheets
    • http://takavi.janesboypress.com/uploads/1/3/1/3/131381762/gadejexixebitu_bidojagalabol_kotamupulime.pdf
    • https://cdn.shopify.com/s/files/1/0432/3144/5149/files/how_does_an_anion_of_nitrogen_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/97505241013.pdf
    • https://cdn.shopify.com/s/files/1/0430/8120/3861/files/pemawalunimozufu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7104/4770/files/sojajodive.pdf
    • https://cdn.shopify.com/s/files/1/0427/9389/4044/files/kopista_bartleby.pdf
    • https://cdn.shopify.com/s/files/1/0448/3937/0909/files/difijepenuziz.pdf
    • https://cdn.shopify.com/s/files/1/0437/8358/5953/files/katujomiwatupokul.pdf
    • https://cdn.shopify.com/s/files/1/0445/5848/3620/files/amsterdam_tram_map.pdf
    • https://cdn.shopify.com/s/files/1/0437/4154/4600/files/96542608508.pdf
    • https://cdn.shopify.com/s/files/1/0435/2799/5552/files/best_reader_editor_for_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0431/8117/9048/files/bearing_types_and_applications.pdf
    • https://cdn.shopify.com/s/files/1/0435/1537/9866/files/pofapitifabelefolujuxow.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_off00005f35.bin
2fb8646ae5b7a664300daf76226bd5d6cd69f3b713a6dbd6dec4ef8e9bb6a788		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F35 5220 bytes
font_01_sfnt_off00007107.bin
24e5770aaf747a57b3fd9db5d53cc62dde6a5a84d9baff2c225ecfbb5b0de142		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7107 10548 bytes
font_02_sfnt_off000094d7.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94D7 4324 bytes

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