Malicious PDF — malware analysis report

Static analysis result for SHA-256 91074aa8b881bb0e…

MALICIOUS

PDF

40.2 KB Created: 2020-09-02 01:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e580d163901119a0cfb269d5516804c SHA-1: 3f12c16c3e636c380cec4859b82e79ada857fabd SHA-256: 91074aa8b881bb0e4298ab50bdd95926bdb514032c38efa37e71045f507bad2f
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/wix?keyword=collective+nouns+worksheet+8th+grade'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to Shopify domains. The document body, though partially corrupted, contains text related to 'collective nouns worksheet 8th grade' and the malicious URL, suggesting a lure to disguise the malicious intent. 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.cc/wix?keyword=collective+nouns+worksheet+8th+grade
    • https://cdn.shopify.com/s/files/1/0430/4066/9849/files/angular_material_drag_and_drop_form_builder.pdf
    • https://cdn.shopify.com/s/files/1/0440/2210/4229/files/96424043694.pdf
    • https://cdn.shopify.com/s/files/1/0440/8400/2981/files/66321965186.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/84324088512.pdf
    • https://cdn.shopify.com/s/files/1/0431/1718/3130/files/madasunoriwedosus.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6201/files/gorivasomup.pdf
    • https://cdn.shopify.com/s/files/1/0433/6844/8165/files/27688208133.pdf
    • https://cdn.shopify.com/s/files/1/0438/4302/7104/files/22427484867.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/delete_a_group_on_facebook.pdf
    • https://cdn.shopify.com/s/files/1/0431/5653/7505/files/50094764700.pdf
    • https://cdn.shopify.com/s/files/1/0440/2708/4965/files/xezibosuwirisuki.pdf
    • https://cdn.shopify.com/s/files/1/0433/9813/5966/files/kittens_game_religion.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_off0000571a.bin
7d6d8528cd3cd8e445b97217f5cea6c4439b29d71845c13c1899150a609484c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x571A 5516 bytes
font_01_sfnt_off000069e0.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69E0 1800 bytes
font_02_sfnt_off0000726c.bin
e85b27cb30a1828a9cbef460acacee81ec647e2cb9f436bb0178ab937f3c5cb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x726C 9792 bytes

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