Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f411b32da9f263…

MALICIOUS

PDF

41.7 KB Created: 2020-08-31 12:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c57c78b84a1ced827c9a3667fe34a9ee SHA-1: d749a2fbdf7229f0a4d625a56bce26d781ee0159 SHA-256: e0f411b32da9f263602883ef74f1e056947353410ef51de067e0d7fdcca8960d
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a mass of external links, suggesting an attempt to drive traffic to potentially harmful sites. The ML classifier also strongly flagged this PDF as malicious. The presence of the URL https://ttraff.com/wix?keyword=firefight+brandon+sanderson, identified as a malicious redirector, is a primary indicator of malicious intent.

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.com/wix?keyword=firefight+brandon+sanderson
    • https://static.usrfiles.com/ugd/80c1db_f5cbb6e4111e4292bcd314804e5aef96.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c3186151282412994eede7da5cfc590.pdf
    • https://static.usrfiles.com/ugd/b5aed9_5fe8bd65815e4ec2a2adefb8785ce1bd.pdf
    • https://static.usrfiles.com/ugd/accd1f_f0fb72d1cb1f43c5a219a9897d4e1ed1.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c2b4949788c4213a65bdd99df67cc4b.pdf
    • https://static.usrfiles.com/ugd/b8c837_fae215fcc8554218abf0cf5653c3ead0.pdf
    • https://static.usrfiles.com/ugd/b8c837_0f6ca73f67e24d3f811886b111bc1d4b.pdf
    • https://static.usrfiles.com/ugd/b8c837_d378c785c3a0437c859699ae2eeee276.pdf
    • https://static.usrfiles.com/ugd/253000_c2caebef3bac44079607f19673b6cd47.pdf
    • https://static.usrfiles.com/ugd/b8c837_f139695ee2484889a870e9f9d6725a17.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e9fc9db0e64478096045226b572b620.pdf
    • https://static.usrfiles.com/ugd/7a11b0_e866ce8dc86d4378a37626ad96c613c4.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/17181021178.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5276/files/92988027500.pdf
    • https://cdn.shopify.com/s/files/1/0435/0767/9387/files/xelidozub.pdf
    • https://cdn.shopify.com/s/files/1/0435/7872/0414/files/90518949840.pdf
    • https://cdn.shopify.com/s/files/1/0432/8030/2244/files/nusalasote.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_off00006435.bin
28878338f1276026899a99f215cfdeae52dde2e5ac428b774f7ee8621be5936e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6435 5232 bytes
font_01_sfnt_off000075fc.bin
b766811da76cec3cf341a05766e4d7439842052c23bd464e4157882c3159ba18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75FC 10480 bytes

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