Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb53d84a6af1f46…

MALICIOUS

PDF

42.6 KB Created: 2021-05-17 23:12:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6b6720d3610d04fa0c500ff6be3058c8 SHA-1: 231704951b7d4fc70dbf2b3d186be3c1f6d832f4 SHA-256: bbb53d84a6af1f4671a6369bd5d1139109c2e9a9fc82b3f6439715eccdb2a92a
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a lure for game hacks and free currency, directing users to a malicious redirector. It also contains instructions to disable security software, indicating a malicious intent to bypass defenses. The ML classifier strongly flagged this PDF as malicious, and embedded URLs suggest a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.xyz/app/431946152/roblox-group-free-robux-game-hack In PDF document text
    • https://javexglobal.com/image/data/files/como-sacar-buen-puntaje-en-juego-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://javexglobal.com/image/data/files/coin-master-tool-hack_GM406889139.pdfIn PDF document text
    • https://javexglobal.com/image/data/files/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • https://javexglobal.com/image/data/files/coin-master-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://javexglobal.com/image/data/files/roblox-hack-com_GM431946152.pdfIn PDF document text
    • https://javexglobal.com/image/data/files/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • https://javexglobal.com/image/data/files/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • https://javexglobal.com/image/data/files/coin-master-hack-tool-without-human-verification_GM406889139.pdfIn PDF document text
    • https://javexglobal.com/image/data/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • https://javexglobal.com/image/data/files/free-spin-link-in-coin-master-game_GM406889139.pdfIn PDF document text
    • https://javexglobal.com/image/data/files/moonactive-coin-master_GM406889139.pdfIn PDF document text
    • https://javexglobal.com/image/data/files/coin-master-free-spins-link-deutsch-ios_GM406889139.pdfIn PDF document text
    • https://javexglobal.com/image/data/files/www-coinmaster_GM406889139.pdfIn PDF document text
    • https://javexglobal.com/image/data/files/coin-master-free-spins-app-android_GM406889139.pdfIn PDF document text
    • https://javexglobal.com/image/data/files/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • https://javexglobal.com/image/data/files/moonactive-free-spins-link_GM406889139.pdfIn PDF document text
    • https://javexglobal.com/image/data/files/coin-master-invite-friends-hack_GM406889139.pdfIn PDF document text
    • https://javexglobal.com/image/data/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://javexglobal.com/image/data/files/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • https://javexglobal.com/image/data/files/roblox-hack-generator_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_003_off00004af0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AF0 25548 bytes
SHA-256: 6fe2e48ee4c1b7d28487b97886db37100c2fc1c7208ae06cf1318e4baa80df7f
font_01_sfnt_off00008404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8404 18264 bytes
SHA-256: b2792b9995997ff68e5dfa2acea2bbc639d657441038e216f117c3302624ca62

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