Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85bff81f04cbde9…

MALICIOUS

PDF

44.5 KB Created: 2020-08-22 01:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2870fc71f6c5982cc4c2d91d981d2be5 SHA-1: 63580f9dc5bfcb8d7a5d7dab83bdce87b33ccdd0 SHA-256: f85bff81f04cbde92f441ed693186bbb72a1d0b8630a4cedbfb6191eacf668ed
130 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of external PDF links, suggesting a link farm or redirection attempt. The presence of a visual download button lure further supports the malicious intent. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=sample+school+brochure+templates
    • http://files.chadlutzke.com/uploads/1/3/0/7/130739081/nekazali.pdf
    • http://dofebobaj.friendsofkillarneypark.com/uploads/1/3/1/3/131379730/5496353.pdf
    • http://files.greentreeassociation.com/uploads/1/3/2/6/132695780/5853364.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51994241049.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65760981278.pdf
    • https://cdn.shopify.com/s/files/1/0440/0958/6846/files/voxexuko.pdf
    • https://cdn.shopify.com/s/files/1/0433/1097/3083/files/xafogul.pdf
    • https://cdn.shopify.com/s/files/1/0430/6809/6661/files/owners_manual_tesla_3.pdf
    • https://cdn.shopify.com/s/files/1/0436/2217/0787/files/bukusamukevilo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8800/2710/files/57273891418.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_off000064b2.bin
8051c8f26f53d5fe61ad77abd41832a1e864a792c1d51f42a2c23723a63f82cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B2 5416 bytes
font_01_sfnt_off000076ec.bin
7fc77c9a4e9a0b3e7864e76032cd144ffd7f94210b1aceaf49c54b092030eb35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76EC 14984 bytes

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