Malicious PDF — malware analysis report

Static analysis result for SHA-256 90790735ecc288dd…

MALICIOUS

PDF

26.5 KB Created: 2020-04-08 11:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 041e3b862c1f2b9aa1d9c9fb99aebf01 SHA-1: 24223111ca4c3d05c35f354de0e1072b1da20277 SHA-256: 90790735ecc288dd73a4e08fd284fa12f3611f7e88f75dbcee58740a132946cf
112 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF is identified as an image-only lure, typical of phishing campaigns. It contains numerous external links, with a dominant host of 'allaurora.club', suggesting a link farm designed to redirect users. The primary URL, http://rgtilestone.com/uploads/1/3/1/4/131437464/131437464.html#do%C3%B1a+barbara+capitulo+37+en+espa%C3%B1ol, is likely the initial landing page for the attack. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 26 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://rgtilestone.com/uploads/1/3/1/4/131437464/131437464.html#do%C3%B1a+barbara+capitulo+37+en+espa%C3%B1ol
    • http://allaurora.club/uploads/1/3/0/3/130323952/vidodojisadom.pdf
    • http://starrisehomecare.org/uploads/1/3/0/2/130272619/1933195.pdf
    • http://royaattar.com/uploads/1/3/1/3/131380183/pajowu.pdf
    • http://jotthemdown.com/uploads/1/3/0/5/130588618/tojumulenugud.pdf
    • http://t0mb0ii.com/uploads/1/3/0/5/130543467/vukuragugezijuv.pdf
    • http://playerscorner.net/uploads/1/3/1/1/131164136/lixirapadarexe.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_off0000457e.bin
99e193a4d8b1a13ce4dce15c0d8ef86e980aff6ce796e9bee186f87f0739e617		 pdf-font-stream PDF embedded font (sfnt) at offset 0x457E 5636 bytes

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