Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec721518a9d4b1e…

MALICIOUS

PDF

35.4 KB Created: 2021-06-20 11:16:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 93711ebcebbd56d7ceeb7505aa2e72ca SHA-1: cb8f8b99b3beef05460cbe414906b745dd0daa84 SHA-256: aec721518a9d4b1e6574132256e11b05293c8bd75813e3aa1f1965174c498b31
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one to 'netcdn.co', which is flagged as a lure for free game hacks. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains similar lure text and URLs, suggesting the primary goal is to redirect the user to a site that likely hosts malware or phishing content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://netcdn.co/app/431946152/marshmello-t-shirt-roblox-free-game-hack PDF link annotation
    • http://elib-s2.ubl.ac.id/repository/free-roblox-accounts-that-work-2021_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/robux-free-com_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/roblox-hack-cheat-free-robux-generator-online-exploit_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/best-hacks-for-counter-blox-roblox-offensive_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/roblox-hack-week-2021_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/get-free-robux-no-joke_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-roblox-exploits-2021_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/testing-5-ways-to-get-free-robux-it-worked_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/roblox-sign-in-free_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/hack-app-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-hack-critical-strike-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/claim-free-robux-kid-friendly_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31AE 22704 bytes
SHA-256: 150a6ee9550c725c6bd28dda0e804ec4bc0612fc5baca97b7023134b9e7a04b9
font_01_sfnt_off00006463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6463 19496 bytes
SHA-256: 29e873694932cc794ea45c775d6e2bf5f2862860c6fc2b5644487e71c974f7e1

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