Malicious PDF — malware analysis report

Static analysis result for SHA-256 1355808d2124b5b1…

MALICIOUS

PDF

45.9 KB Created: 2021-06-10 14:26:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 2da9bcaf8317b9316f3ceb4971b54854 SHA-1: 3976f7ee5f104afc5b99d2e28a4c513e31d4e503 SHA-256: 1355808d2124b5b1e2df24deb213c3c3a77a92dcd0629bf6cf4e3f2ddf5c986d
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free Robux' generators and game hacks. The document body, though heavily obfuscated, contains a primary URL that aligns with the heuristic findings. The presence of these lures and redirectors strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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.
  • 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/roblox-free-robux-2021-game-hack In PDF document text
    • http://halle-wasserball.de/images/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://halle-wasserball.de/images/free-tiktok-followers-app_GM835599320.pdfIn PDF document text
    • http://halle-wasserball.de/images/minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://halle-wasserball.de/images/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://halle-wasserball.de/images/pokemon-go-free-spoofer-ios_GM1094591345.pdfIn PDF document text
    • http://halle-wasserball.de/images/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://halle-wasserball.de/images/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://halle-wasserball.de/images/spin-link_GM406889139.pdfIn PDF document text
    • http://halle-wasserball.de/images/free-robux-https-robuxplanet-com-r_GM431946152.pdfIn PDF document text
    • http://halle-wasserball.de/images/free-robux-legit_GM431946152.pdfIn PDF document text
    • http://halle-wasserball.de/images/freer-pro-tiktok_GM835599320.pdfIn PDF document text
    • http://halle-wasserball.de/images/hack-xp-net-generators-coin-master_GM406889139.pdfIn PDF document text
    • http://halle-wasserball.de/images/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://halle-wasserball.de/images/tiktok-like-bot-free_GM835599320.pdfIn PDF document text
    • http://halle-wasserball.de/images/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://halle-wasserball.de/images/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://halle-wasserball.de/images/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://halle-wasserball.de/images/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://halle-wasserball.de/images/free-tiktok-accounts-and-passwords_GM835599320.pdfIn PDF document text
    • http://halle-wasserball.de/images/free-robux-on-phone_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_off00005360.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5360 26072 bytes
SHA-256: 4ceee5484f4e2e50921ade0b2bd035c3688c22d6642b1526d9c08400ac8563ff
font_01_sfnt_off00009064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9064 18488 bytes
SHA-256: a3208fce9527d2278c234a1a61d28fcd25fb7af8e8cbd61a3e8613f4dc1586fb

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