Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd39a79540656b63…

MALICIOUS

PDF

40.9 KB Created: 2021-05-17 03:24:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 07ec4d2eb2c89a8d0ce67dc8f767f351 SHA-1: addac6e658a263bfa0cf17c97e7fcb5d72590d37 SHA-256: fd39a79540656b634e1ab58e212c122dcf55afd0889fe93cb575512ace9f6c9e
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors, specifically advertising 'Coin Master Hack' lures. The document body, though heavily obfuscated, contains references to these lures and the malicious URL. The presence of a download button heuristic further supports the malicious intent of directing users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/coin-master-hack-here-game-hack In PDF document text
    • http://briankellyforcongress.com/images/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://briankellyforcongress.com/images/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://briankellyforcongress.com/images/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://briankellyforcongress.com/images/blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://briankellyforcongress.com/images/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://briankellyforcongress.com/images/roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • http://briankellyforcongress.com/images/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://briankellyforcongress.com/images/robux-generator-that-works_GM431946152.pdfIn PDF document text
    • http://briankellyforcongress.com/images/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://briankellyforcongress.com/images/new-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://briankellyforcongress.com/images/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://briankellyforcongress.com/images/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://briankellyforcongress.com/images/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://briankellyforcongress.com/images/how-to-make-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://briankellyforcongress.com/images/free-minecraft-premium-account_GM479516143.pdfIn PDF document text
    • http://briankellyforcongress.com/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://briankellyforcongress.com/images/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://briankellyforcongress.com/images/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://briankellyforcongress.com/images/free-spin-coin-master-new-link_GM406889139.pdfIn PDF document text
    • http://briankellyforcongress.com/images/free-pet-food-coin-master_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_003_off0000487d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x487D 23936 bytes
SHA-256: a1d6fc2c6a7894fc3f72e7b040aa13cb8fb00e4d41aec68fc22e64b8f4b856a1
font_01_sfnt_off00007efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EFD 17716 bytes
SHA-256: c15a8689411d8cca9ab0759ab4c496fe9b4353d676dd738e300719e9588112ed

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