Malicious PDF — malware analysis report

Static analysis result for SHA-256 a592aa771aed0ca3…

MALICIOUS

PDF

43.7 KB Created: 2021-06-08 20:00:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f1a83f9342139dcce383be27cc0fdd1c SHA-1: edcf118fea4a03a871e38694a18d398c70c1b9d6 SHA-256: a592aa771aed0ca36ef864033ae9c59e88e62324110942493a55c1062ba56262
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as game hacks and generators. The primary lure directs users to a URL associated with Roblox cheats. While no scripts were extracted, the embedded links and heuristic firings strongly indicate a phishing or scam attempt designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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 https://netcdn.tw/app/431946152/roblox-cheat-money-lumber-tycoon-2-game-hack In PDF document text
    • http://heilzentrum-ulm.de/images/free-tiktok-accounts_GM835599320.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-booga-booga-mojo-hack_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-no-humen-varucashe_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-hack-a-person-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/everything-free-in-roblox-catalog_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-free-robux-2021-march_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-tiktok-likes-generator_GM835599320.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/20210-free-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-instantly-2021_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-hacks-that-work_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/easy-roblox-hacks-not-malware_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-spins-coin-master-app-iphone_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-18_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-can-i-get-free-coinsn-coin-master_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-hack-2021-working_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-free-robux-on-computer_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_off00004f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F05 24592 bytes
SHA-256: 476179ecbb442c67eddbef1d5da37c9859ed80c87564c13139b240ebe40bd6f5
font_01_sfnt_off00008560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8560 19184 bytes
SHA-256: 9073146d5d17c0d1dcb4e147298215ff7768d4e7cea005255e1b25461ad3fdac

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