Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b561370f50e5da…

MALICIOUS

PDF

44.8 KB Created: 2020-08-29 01:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3da8e012833fa5e67dd31aff30ddc07 SHA-1: d5358a1f970bb35427d41d85782df23c3b45e7f3 SHA-256: a5b561370f50e5daf2bfd29d6c35186b5b1928c3b3621777f625439e3f516703
150 Risk Score

Malware Insights

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

The PDF file contains a high number of embedded links, many of which point to a redirector URL. The primary malicious URL identified is https://ttraff.com/wix?keyword=starbucks+north+star, which is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL and references to 'Starbucks north star', suggesting a lure.

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.com/wix?keyword=starbucks+north+star
    • https://static.usrfiles.com/ugd/b8c837_8f125fccc3ae4256ac7835c55a89af43.pdf
    • https://static.usrfiles.com/ugd/b8c837_e6d01602948841ca831d1d93a96542a2.pdf
    • https://static.usrfiles.com/ugd/b8c837_786df7fde3b647fda9709b813914d8c2.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3285/files/ruzasotevuruvivoxojife.pdf
    • https://cdn.shopify.com/s/files/1/0437/6936/4631/files/28618256256.pdf
    • https://cdn.shopify.com/s/files/1/0434/5934/6582/files/lower_back_pain_strengthening_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0435/8130/9085/files/26075648673.pdf
    • https://cdn.shopify.com/s/files/1/0436/5680/6553/files/grammar_exercises_elementary.pdf
    • https://cdn.shopify.com/s/files/1/0432/2862/7108/files/dowegubigaginesiwizu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0124/9955/files/dijakuduxevinakabogiroj.pdf
    • https://cdn.shopify.com/s/files/1/0435/4588/6884/files/sijivonatenon.pdf
    • https://cdn.shopify.com/s/files/1/0430/0144/6551/files/microsoft_ehome_infrared_transceiver.pdf
    • https://static.usrfiles.com/ugd/b8c837_64a5360b754243ffa1bec505528476f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_41c9f0d5e1cc4f4baa542f3dbb10501a.pdf
    • https://static.usrfiles.com/ugd/b8c837_399118f2549c40978629cf89fc0d8baf.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f878df0ea8b4a448d5abcb9aa01e1cc.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_off00006757.bin
b9db1e9b61ce0ce91b236297b177231dc5dadfbe7c5e64bca7c9e876e96540b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6757 5160 bytes
font_01_sfnt_off000078d2.bin
20f538202b1a8ce6f428b142c09d6f73dc27a1ca47ecc85f8030d6116e4d28af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78D2 14236 bytes

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