Malicious PDF — malware analysis report

Static analysis result for SHA-256 2844af9ae874e443…

MALICIOUS

PDF

45.5 KB Created: 2021-06-04 01:52:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 24ef23a8208765c4ed1c2a1a7068251d SHA-1: 8d48f19b4e814c12e0c229d2f090cad9fdbd9695 SHA-256: 2844af9ae874e443c44f8175c32f68374d8dfda5929b9e2afeaa370a4f46de12
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically a site offering 'free Robux' or 'game hacks' without verification. This pattern is indicative of a phishing or scam lure designed to lead users to potentially harmful content or further malware downloads. The presence of multiple redirector links and a high ML classifier score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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.online/app/431946152/free-robux-with-no-verification-2021-game-hack In PDF document text
    • http://library.umla.ac.id/repository/coin-master-hack-app-android_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-to-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-hack-without-verification-for-iphone_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/get-gold-coin-master-village-hack_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/minecraft-java-code-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-games-to-play-for-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-village-4_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/mc-update_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-spins-coin-master-october-17-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/fast-robux-online_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/clean-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/easy-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-hack-apk-android-1_GM406889139.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_off000050c9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50C9 25472 bytes
SHA-256: 588efd8abb24f957c52778c3e97eec616be2993866968426ba41b3f839e25de5
font_01_sfnt_off00008bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BF7 19368 bytes
SHA-256: aac922b8691acc9aa277dffee065f580c863b50a75d1a5b8a64d6db85e21622d

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