Malicious PDF — malware analysis report

Static analysis result for SHA-256 af73e99e69a60962…

MALICIOUS

PDF

46.8 KB Created: 2021-05-16 00:08:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c46e3f0dc10282ce53d621c1263f63af SHA-1: 0dc425d87fe978d56e6379088d2b70e03b02aa28 SHA-256: af73e99e69a60962ae2c18e1fa1b38c5ba3f22fc546fbc3b971544521c40c13b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free generator / game hack' lures. The document body and embedded URLs suggest a social engineering attempt to trick users into downloading potentially malicious content. The presence of embedded URLs and the nature of the lures strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/431946152/free-roblox-codes-2021-game-hack In PDF document text
    • https://ethraa-sys.com/userfiles/files/today-free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/legit-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/real-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/como-descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/pop-slots-free-vegas-casino-slots-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/roblox-lawsuit_GM431946152.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/coin-master-mod-free-download_GM406889139.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/free-2021-robux_GM431946152.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/coin-master-game-hunters-club_GM406889139.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/free-apk-mod-coin-master_GM406889139.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/roblox-inappropriate-games_GM431946152.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/coin-master-unlimited-spins-apk-free-download_GM406889139.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/free-robux-come_GM431946152.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/coin-master-free-spin-whatsapp-group-link_GM406889139.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ae4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AE4 27256 bytes
SHA-256: eddd24df227972bbe9a3dc4cb3c0eb53d729338c0b1a33ec70b69730ae8ee789
font_01_sfnt_off0000899f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x899F 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off0000938a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x938A 18524 bytes
SHA-256: 2cb7cffe6898b24bffb42f458692356b56cf8186bc9d806687ffddb45d527cfe

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