Malicious PDF — malware analysis report

Static analysis result for SHA-256 86230ecef1f22d45…

MALICIOUS

PDF

26.6 KB Created: 2020-06-10 04:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 086481a6543afedf71cb25ae3156415b SHA-1: 2fee3f12ee6327967e6e4dc5ad25eabc99e08523 SHA-256: 86230ecef1f22d4527cc9dd71ad9f565c7b7145a2be352036c96dbe7c5801592
114 Risk Score

Malware Insights

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

The PDF document is identified as a malicious screenshot lure, containing numerous external links. The primary link, http://74-123-72-38.mgwnet.com/uploads/1/3/0/5/130590521/130590521.html#gay+porn+myvidster, appears to be the initial landing page. The document body contains obfuscated text and embedded URLs, suggesting an attempt to disguise malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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
  • 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://74-123-72-38.mgwnet.com/uploads/1/3/0/5/130590521/130590521.html#gay+porn+myvidster
    • http://heartandsound.co.uk/uploads/1/3/1/4/131454057/9359819.pdf
    • http://twocsflipflops.com/uploads/1/3/0/4/130488574/9376563.pdf
    • http://lehighvalleyofficiant.com/uploads/1/3/0/2/130272973/86bf4.pdf
    • http://4fk.undesirable.us/uploads/1/3/0/6/130604996/1a9db2c.pdf
    • http://stefanotex23.com/uploads/1/3/0/8/130813483/e9fc24e6a38.pdf
    • http://riannehawkins.com/uploads/1/3/1/8/131858043/8959994.pdf
    • http://autodiscover.scarboroughmaineyoga.com/uploads/1/3/1/4/131437770/b6cef15bf03a.pdf
    • https://puvaperozani.files.wordpress.com/2020/06/93678734240.pdf
    • https://moribunenola.files.wordpress.com/2020/06/pazidesimijigepa.pdf
    • https://vivetevu.files.wordpress.com/2020/06/41693174665.pdf
    • https://riburawonak.files.wordpress.com/2020/06/roxugudop.pdf
    • https://wupojawafosa.files.wordpress.com/2020/06/85030195701.pdf
    • https://sosinogezop.files.wordpress.com/2020/06/89055807322.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_off0000440c.bin
9b9809dfa533a50416376c584a23e097470bd28f06b8ec5ed84431aaf75681cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x440C 8112 bytes

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