Malicious PDF — malware analysis report

Static analysis result for SHA-256 123d7154cacbdf78…

MALICIOUS

PDF

45.9 KB Created: 2021-06-11 02:42:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 41be52e191d879fe86c271ee65cef428 SHA-1: a8c4ef83581f130e2dba2a90b3bc5cd651e5921f SHA-256: 123d7154cacbdf78dfe4fbe254846c8dac6b3be2a1b9d8a620384c81de2f1597
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains, specifically advertising 'free generator / game hack' content, which is a common lure for phishing or malware distribution. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/how-to-get-free-stuff-in-catalog-roblox-2021-nick-game-hack In PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-exploit-download_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/filtered15zip-roblox-hack_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-change-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-promo-codes-2021-not-expired-november_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-for-free-no-human-verification_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/breaking-point-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/pubg-uc-rate-in-india_GM1330123889.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/noclip-hack-roblox-jailbreak-may2021_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/will-minecraft-ever-be-free_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-money-cheat-codes_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/minecraft-xbox-one-code-free_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-codes-for-robux-2021_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/spiderman-free-roblox-stuff_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-roblox-accounts-with-robux-2021-november_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-tiktok-accounts_GM835599320.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/minecraft-free-install_GM479516143.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
stream_004_off00005389.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5389 25840 bytes
SHA-256: 7722acaed2d3b4db152b0b9186c3ba3a0fc3550620332fd721683340517da94a
font_01_sfnt_off00008d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D0C 19564 bytes
SHA-256: 4e14812c491a6c6352205d56702bb90c7e78497cf535eaf7c49f9fdcab0b0d1d

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