Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd37b6b6d747fb4…

MALICIOUS

PDF

63.2 KB Created: 2020-08-31 04:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3678ac050a9d1b7345f2c6ffc1b2647c SHA-1: a8ada32428fbcb2ebd65495945d9ecaa461fc752 SHA-256: ddd37b6b6d747fb4e3324862c46f106899f5c90ce3ff8dbed14452d79d915952
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high density of external links, many of which point to a redirector. The primary malicious URL identified is https://ttraff.cc/wix?keyword=justified+season+4+cast, which is associated with known malicious redirector infrastructure. The document body contains obfuscated text and metadata, suggesting an attempt to disguise its malicious intent. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=justified+season+4+cast
    • https://static.usrfiles.com/ugd/576447_b1437c1143ed4587a43d890d07db7854.pdf
    • https://static.usrfiles.com/ugd/33c377_07f35eec45e149da9cc07398f9b48857.pdf
    • https://static.usrfiles.com/ugd/0d9a50_251c7fa6a80d45d7946b96aba7c70205.pdf
    • https://cdn.shopify.com/s/files/1/0434/5076/1377/files/pevitalawopogi.pdf
    • https://cdn.shopify.com/s/files/1/0459/1216/2453/files/pdf_files_not_ing_in_chrome.pdf
    • https://static.usrfiles.com/ugd/eed56f_333a52da9f3b441ba24ede5aaed58c8b.pdf
    • https://static.usrfiles.com/ugd/3cb679_85d138d0bbe74c68a48f165509cb8e48.pdf
    • https://static.usrfiles.com/ugd/0ad6c7_27942006322c4aa794afcc8bdcb977f0.pdf
    • https://static.usrfiles.com/ugd/6924eb_75e5f21b975f4511a82c87f69b098e08.pdf
    • https://static.usrfiles.com/ugd/2274a7_db03abd1ac3d458ca340ae0c0add9a55.pdf
    • https://static.usrfiles.com/ugd/538d67_fd8dd44afca149e390e86c18c3dead03.pdf
    • https://static.usrfiles.com/ugd/54fa57_9af3ce3dc3354766b9bb0456b8be3809.pdf
    • https://static.usrfiles.com/ugd/b8c837_5b35804b4e1b42b0b027bcbe58865553.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_off0000bb8e.bin
3eea4fbba6768ea0771b5003df2cfbd799ea355affd12986ff1d345b21f18380		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8E 4964 bytes
font_01_sfnt_off0000cc8a.bin
fbb30cc9161ac7f82d534b3f6e7ea364fe5702bc72febf0bf040f8d06cdc10f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8A 10376 bytes

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