Malicious PDF — malware analysis report

Static analysis result for SHA-256 649f9ed96eada6b1…

MALICIOUS

PDF

46.1 KB Created: 2020-04-24 07:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3b70445e782f05a1f4f55d20c80d09c2 SHA-1: 1921fabff5453a2544d343c12ba4439a5a1cd81f SHA-256: 649f9ed96eada6b1b941ac6892ffdc2fbb3b10e1c259e1c13a071c2e8c456671
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to external websites, many of which are structured as numeric slugs, indicating a potential link farm for SEO manipulation or malware distribution. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://tuttletours.net/uploads/1/3/0/6/130605405/130605405.html#disgaea+1+switch+guide
    • http://brittainresorts.net/uploads/1/3/1/1/131164375/woworuwizurak.pdf
    • http://happymothersdayloveaustin.com/uploads/1/3/1/3/131384424/lovixogipadof_zigiderolafaz_fikalowifafabu.pdf
    • http://trendy-grace.com/uploads/1/3/1/4/131455463/pesuzonetun.pdf
    • http://pdxprotree.com/uploads/1/3/1/4/131453408/wimaxumesopu_titelejenavik.pdf
    • http://a-plus-medical-supplies.com/uploads/1/3/0/6/130639959/givupujugaziz_xosifumo_watel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b18.bin
db9d526157e25166817a43e35f909ce0e32f3cc9539e0219879be15342607852		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B18 8468 bytes
font_01_sfnt_off00008b90.bin
d59c126e0baab1f35add49d1645d0ec98429421a9b10d1f459a50f7fe0e008cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B90 6712 bytes
font_02_sfnt_off0000a13f.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA13F 2652 bytes

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