Malicious PDF — malware analysis report

Static analysis result for SHA-256 1770f0d2cf0219d4…

MALICIOUS

PDF

41.5 KB Created: 2020-04-09 09:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 04619632ee3d023128b83f7a7c7d5ae0 SHA-1: 7e57827aec3366cf74651d7bd743a08ee2a107cc SHA-256: 1770f0d2cf0219d431b2adb17aa5ef5eacfde3b22fad575ec5aecbe38594c37c
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links to various domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous unknown URLs indicates a high likelihood of malicious intent. No scripts were extracted, but the sheer volume of external links points to a distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://lilarot-vipshop.eu/uploads/1/3/1/4/131453684/131453684.html#9+isomeros+de+c7h16
    • http://comesailingcharterschicago.com/uploads/1/3/1/4/131437885/3691752.pdf
    • http://liftupp.org/uploads/1/3/0/7/130775635/9092855.pdf
    • http://miamorebaby.com/uploads/1/3/1/3/131379685/d8c4ce4.pdf
    • http://hermesmercy.com/uploads/1/3/0/6/130620859/048231448cf0.pdf
    • http://vr-authority.com/uploads/1/3/0/7/130739891/d7a1140178de.pdf
    • http://njjitney.com/uploads/1/3/1/3/131379729/dowivo.pdf
    • http://watchitalltv.com/uploads/1/3/0/7/130739369/nibafe-fopefabuko-xozuripuwosij-gopululojoxowa.pdf
    • http://caseguide.org/uploads/1/3/0/4/130483978/nafunex-rikawi-felitofidab.pdf
    • http://corpdevco.com/uploads/1/3/0/3/130324278/toramuxovavuk-vavakapixobuzi.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064eb.bin
35dede5ce8150e7d553d4b0ab13b55d8dc50ca6679446b7338f8a5cbe50fa2ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64EB 8160 bytes
font_01_sfnt_off00008314.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8314 16036 bytes

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