Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d30447b867532a4…

MALICIOUS

PDF

46.6 KB Created: 2020-09-01 20:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fac48f540d251960912bc5501247ebfb SHA-1: f91f7aa1357ecdf357605c19fc06d69afde59c3c SHA-256: 0d30447b867532a41dece5d33b124113e6e9e6e2b221f0bfd749ee30dbe44d65
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/wix?keyword=oxonium+salt+formation', which is likely intended to lead the user to a malicious site. The presence of numerous other PDF links suggests a link farm or SEO poisoning tactic to distribute malicious content.

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.ru/wix?keyword=oxonium+salt+formation
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/225520_0041115b7fbf4aac81773a74a185ff3d.pdf
    • https://static.usrfiles.com/ugd/08fe48_495462a89f2740b8900e094cb4a59670.pdf
    • https://static.usrfiles.com/ugd/2f07a1_5ab7c545730d47128eb2db283dcd333d.pdf
    • https://static.usrfiles.com/ugd/b52961_b969aafcd59241ffa66fa1b097fe7f74.pdf
    • https://static.usrfiles.com/ugd/895bef_02b02dcb01d04647912dc7eb6ac6766f.pdf
    • https://static.usrfiles.com/ugd/b8c837_33d84e90bdab4954aa2d72f930cf5664.pdf
    • https://static.usrfiles.com/ugd/39cb9d_c3a86b3a74e7498881051cd0a6b1a7ef.pdf
    • https://static.usrfiles.com/ugd/dd4472_39293b42ed98443aaa10a21d10284bc9.pdf
    • https://static.usrfiles.com/ugd/b7082a_0a3748765a0b4210a4972ecf37768b20.pdf
    • https://static.usrfiles.com/ugd/35e1ce_05782a077863404e85004945351860d0.pdf
    • https://static.usrfiles.com/ugd/b8c837_2b1bded44bc649df9930a58778dcf501.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_680a5e753b544498a2a5c7a0dabca9f1.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064d6.bin
d181bfeb8a9b256b7a301c47215aa15e155013d47e05d128eae63d6e5b5b4ba3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64D6 5008 bytes
font_01_sfnt_off000075cd.bin
70b0fed7dd1c3f1e3472f78840878b44a145daddef96b35d32db020b9f18a8ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75CD 10288 bytes
font_02_sfnt_off0000993f.bin
b10e7a0583bf6b216a5471aeed10f14210f1dda3adb60ac5169fcb38ba12e60c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x993F 16060 bytes

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