Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1cc3bce8d6a6e7…

MALICIOUS

PDF

49.8 KB Created: 2020-04-12 23:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8926f52ed66b2f36ec68e66f5c6129b5 SHA-1: 8d931b4b36ebde05fd15fe45ebeed0390f5a2332 SHA-256: da1cc3bce8d6a6e7a82bcc363d53e713a0f01fe916436a7f1983dca894dfdb44
62 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files with numeric or generic slugs on various domains. This indicates a link farm or SEO spam tactic designed to drive traffic to these sites. The document body, though partially corrupted, suggests a lure related to mathematical exercises, which is likely a pretext to disguise the malicious intent of redirecting users to potentially harmful content.

Heuristics 3

  • 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
  • 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://ecgcore.com/uploads/1/3/0/4/130436018/130436018.html#30+ejercicios+de+diferencial+de+una+funci%C3%B3n+resueltos
    • http://edaudit.services/uploads/1/3/0/6/130620756/db51e5c07ed3.pdf
    • http://miramarmoving.com/uploads/1/3/1/4/131438427/ganutawono.pdf
    • http://flpfishers.com/uploads/1/3/1/4/131407293/lewemili.pdf
    • http://singstrongsinglong.com/uploads/1/3/0/5/130589412/2240d01db5b9c.pdf
    • http://ultimatemediatv.com/uploads/1/3/0/5/130544132/8615162.pdf
    • http://textmvmt.com/uploads/1/3/0/2/130272979/9875644.pdf
    • http://ganaderiaregenerativacolombia.org/uploads/1/3/0/3/130379408/sanolemefakopo-mutajagas-zesogudeweka-losenupak.pdf
    • http://larkspurpta.com/uploads/1/3/0/4/130436439/marobado.pdf
    • http://sarajo.de/uploads/1/3/1/4/131406427/puvabatax.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000779d.bin
1dc8fe379aa3200f7e66923f17ddd9d37179fdffeb1310dcfcdf103531793bf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x779D 9420 bytes
font_01_sfnt_off00009980.bin
3d52fc27d04b8b84b219df719738f768697e09c2050136bc1fe69fcddf4eca6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9980 2652 bytes
font_02_sfnt_off0000a2e6.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2E6 16036 bytes

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