Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce61020f32ad91d1…

MALICIOUS

PDF

46.4 KB Created: 2020-04-15 08:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: c2d85490ae4ad2a1ca262c0d51988524 SHA-1: e2b770d2134fddae960ebd81aba7a2850df21040 SHA-256: ce61020f32ad91d13d1b0adf1cc7c31d409e17d9ebda766985fa5b96e3f9b274
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to seemingly unrelated domains but follow a similar path structure, indicating a link farm or SEO abuse for malicious purposes. The document body, though heavily obfuscated, contains references to 'adobe audition presets' and 'wkhtmltopdf', suggesting a lure to download potentially malicious software or presets. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://blossomchildcare.org/uploads/1/3/0/9/130969678/130969678.html#the+adobe+audition+presets+v2.+0 PDF link annotation
    • http://colorsthatconvert.com/uploads/1/3/0/7/130776002/9856888.pdfIn PDF document text
    • http://davidcarere.com/uploads/1/3/0/4/130483318/765f31.pdfIn PDF document text
    • http://boydsoapsanddesigns.com/uploads/1/3/0/4/130475997/3830100.pdfIn PDF document text
    • http://flavorsdepot.com/uploads/1/3/1/6/131636899/2dadb3aaab.pdfIn PDF document text
    • http://mta53.somekindofsimple.com/uploads/1/3/0/5/130540214/5057938.pdfIn PDF document text
    • http://christonlychrist.com/uploads/1/3/0/6/130621371/7986734.pdfIn PDF document text
    • http://halicocalis.com/uploads/1/3/0/2/130273915/pamevirijo.pdfIn PDF document text
    • http://reachsports.net/uploads/1/3/0/2/130272325/3248170.pdfIn PDF document text
    • http://cubanostreetfood.com/uploads/1/3/0/6/130621404/vetuxum.pdfIn PDF document text
    • https://upload..���In PDF document text
    • http://www.stixfonts.orghttp://www.micropress-inc.comAsIn PDF document text
    • http://www.stixfonts.org/user_license.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/cms/scripts/page.php?site_id=nrsi&id=OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76FB 9176 bytes
SHA-256: aaa961c2a79d6d8dd52950de81e5dba303e96c4ba47d734494c47594997ed7d0
font_01_sfnt_off00009996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9996 10640 bytes
SHA-256: 8eb53d4c2c68eef08123e942bb5078f724a4746dc51873c4aa64d865f2ab8fb1