Malicious PDF — malware analysis report

Static analysis result for SHA-256 541a7dad23b9899b…

MALICIOUS

PDF

46.3 KB Created: 2021-06-09 15:48:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 5fdb9cecc9e7846ab1eca194c85c5667 SHA-1: 8549111fa9d3075f473c1e50a5080ac7a13ec6d9 SHA-256: 541a7dad23b9899b1a0dd86e9fea8ebf392702381b3925e6b7d3917719d3ba2d
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains multiple links to known malicious redirectors and game hack generators, aiming to trick users into visiting these sites. The presence of a fake CAPTCHA heuristic further suggests a social engineering tactic to coerce user interaction. While no scripts were directly extracted, the nature of the lures and embedded URLs points towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/survivor-hacks-script-roblox-game-hack In PDF document text
    • http://heilzentrum-ulm.de/images/roblox-dungeon-quest-get-unlimited-gold-and-free-vip_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-tiktok-likes-generator_GM835599320.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-tiktok-accounts_GM835599320.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/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-game-card-roblox-codes_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/regal-world-coin-master_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/hacking-classes-for-roblox_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/funny-free-roblox-t-shirt_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-anti-cheat-speed_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-admin-lua-script-hack_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-roblox-clothes-and-hair-girl_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-free-robux-without-using-apps_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/hacker-man-roblox-script_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-pastebin_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
stream_004_off0000533f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x533F 26188 bytes
SHA-256: 220447ff6cc9fdb1b5ea8d9022319ea9326622d6cc1134c39f9231afe0d32f7b
font_01_sfnt_off000090be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90BE 18836 bytes
SHA-256: 85e44d4ae2c33da11bbb66a4d16370328f9e221493766dd9924fd6c342fd63e6

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