Malicious PDF — malware analysis report

Static analysis result for SHA-256 0578b60de55f23a9…

MALICIOUS

PDF

35.5 KB Created: 2021-07-08 17:34:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: eeb0b873c8ba8d3f149abf475d029bca SHA-1: 5f589f9fc72a5560ee746150c9db4e01625dd48c SHA-256: 0578b60de55f23a9ddc9d137a983372af35eeb8e912c581b2c570a24117a0c72
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The primary redirector URL is http://netcdn.tw/app/431946152/free-robux-download-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to trick users into downloading potentially malicious files or visiting further compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/free-robux-download-game-hack In PDF document text
    • http://samavetpharm.com/userfiles/files/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-minecraft-gift-card_GM479516143.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-button-roblox-script_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/can-lucky-patcher-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-hack-tool-v1-9-pc_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/hacker-coin-master_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/adopt-me-hack-tool-roblox_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/como-instalar-hacks-para-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-get-free-coins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/minecraft-classic-free_GM479516143.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-free-spins-usa-2021_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-get-free-robux-on-ipad-mini-2021_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/roblox-bubble-gum-simulator-script-hack_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-get-free-tokens-in-minecraft-ps4_GM479516143.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-15-free-spin-link-of-last-5-days_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_002_off00003221.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3221 22748 bytes
SHA-256: b35f217a6edcbfdd34a3932838f852017210d85b33483ab99aa7358c6658868c
font_01_sfnt_off0000650f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x650F 19296 bytes
SHA-256: 5f304289c35a5caca60ae5d5074bee34cff1925eeabd9956883fa8e616b1a204

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