Malicious PDF — malware analysis report

Static analysis result for SHA-256 615d13b57b402326…

MALICIOUS

PDF

40.6 KB Created: 2020-08-31 02:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0dd997280b4e03a7f1fec618477f251b SHA-1: e18b101a010600c40f9baf13b604ff42618ab133 SHA-256: 615d13b57b40232695efd473f7c5df5afef0f8b8cdf77a6f9452b06b53f7bb71
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, one of which points to a known malicious redirector. The document also features a large number of external links, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=holosun+hs403a+vs+hs403b
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_0ed4e5c9e25a441da7a1e67086ae9b1a.pdf
    • https://static.usrfiles.com/ugd/63d3ad_9e9f53eefeef4e3d9ce33682ced74d0c.pdf
    • https://static.usrfiles.com/ugd/ee9d3f_34cb2e3c80f349e0bc22807a58a4402a.pdf
    • https://static.usrfiles.com/ugd/b8c837_676b10df6a5a49e8b9d0f0192a7b4ade.pdf
    • https://static.usrfiles.com/ugd/ab63e3_e2bace85f38441d98a5454dbc8a97333.pdf
    • https://static.usrfiles.com/ugd/e32576_4a1817d0215242bf899ff90ae7520472.pdf
    • https://static.usrfiles.com/ugd/529dbf_c11d8f88deb64185b411240375579ee8.pdf
    • https://static.usrfiles.com/ugd/0779a3_75d7755124c34c2fa0930768fa471d19.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006114.bin
6cdb9190d59f18e321e103b822fc717d2cbb5a5d7c5cd38164e674a631207c7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6114 5232 bytes
font_01_sfnt_off000072da.bin
5a760513e39f11029db993707f557ac3468d5561688ddf437240d60307c18fc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72DA 10372 bytes

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