Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db4c77c2b75aec8…

MALICIOUS

PDF

36.0 KB Created: 2020-04-08 10:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ca37a0be0283a5fd2e355ea644c2a8c7 SHA-1: 02d54c9adb928553658032d7b2e598372273eab1 SHA-256: 1db4c77c2b75aec82e9719ed447061f5768195ae401ae146a62216289402214f
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF exhibits characteristics of a link farm, embedding a large number of external URLs pointing to other PDFs hosted on various domains. The primary URL directs to a document titled 'Rango de una matriz por determinantes ejercicios resueltos', suggesting a lure to educational or informational content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious nature of the embedded links, likely intended for traffic redirection or further malicious payload delivery.

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://offthegrid4x4.net/uploads/1/3/0/5/130544086/130544086.html#rango+de+una+matriz+por+determinantes+ejercicios+resueltos
    • http://merazteachingportfolio.com/uploads/1/3/1/3/131383998/2332580.pdf
    • http://edtechreviews.com/uploads/1/3/0/7/130775192/rikaxulepufebiwad.pdf
    • http://valentinoandfinch.com/uploads/1/3/0/4/130483373/3725041.pdf
    • http://coachmex.com/uploads/1/3/0/4/130476687/tadusova_goxopelobe_lepaj_xavegufijesafa.pdf
    • http://campfirecomplete.org/uploads/1/3/0/6/130604863/dezosenaxaxane.pdf
    • http://laising.org/uploads/1/3/0/7/130738635/d443bf2c789.pdf
    • http://leehuffam.com/uploads/1/3/0/6/130620283/xidoroto.pdf
    • http://cyndibeetravel.com/uploads/1/3/0/3/130379082/fuwug.pdf
    • http://fabulousfelions.com/uploads/1/3/1/0/131071312/nakulufu.pdf
    • http://khloenoelleshop.com/uploads/1/3/0/6/130603925/f0ac4eff.pdf
    • http://neptuneinvesting.com/uploads/1/3/0/5/130543798/4673522.pdf
    • http://atreeoflifeece.com/uploads/1/3/0/6/130604538/nunopuf_kepubod.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006197.bin
341bef7fbe3b4d4c2c8d671cab3e60dfeea169f2bd943807ff8ca37369a408d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6197 8460 bytes

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