Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d05b61302087b61…

MALICIOUS

PDF

44.4 KB Created: 2021-05-17 15:33:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 45afdb28a4be215dac5c9441820751f5 SHA-1: 3ee9cf969947596f008486761f683accb7f7faa4 SHA-256: 5d05b61302087b61c9447c5ee8b19470c042f49a910b99f0130baff4fa8ed6f9
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically promoting "game hacks" and "free robux". The presence of a visual download button and callback lure heuristics further support a phishing or scamming intent. While no scripts were directly extracted, the embedded URLs and heuristic firings strongly indicate a malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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.xyz/app/406889139/game-coin-master-hack-game-hack In PDF document text
    • http://www.notaioricci.it/images/roblox-inappropriate-games_GM431946152.pdfIn PDF document text
    • http://www.notaioricci.it/images/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.notaioricci.it/images/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.notaioricci.it/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://www.notaioricci.it/images/hack-coin-master-spin-apk_GM406889139.pdfIn PDF document text
    • http://www.notaioricci.it/images/free-face-roblox_GM431946152.pdfIn PDF document text
    • http://www.notaioricci.it/images/free-robux-today_GM431946152.pdfIn PDF document text
    • http://www.notaioricci.it/images/free-robux-reddit_GM431946152.pdfIn PDF document text
    • http://www.notaioricci.it/images/coin-master-daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://www.notaioricci.it/images/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • http://www.notaioricci.it/images/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://www.notaioricci.it/images/20210-robux_GM431946152.pdfIn PDF document text
    • http://www.notaioricci.it/images/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://www.notaioricci.it/images/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdfIn PDF document text
    • http://www.notaioricci.it/images/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://www.notaioricci.it/images/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://www.notaioricci.it/images/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.notaioricci.it/images/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://www.notaioricci.it/images/how-to-get-minecraft-for-free-on-tablet_GM479516143.pdfIn PDF document text
    • http://www.notaioricci.it/images/minecraft-items_GM479516143.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_off00004842.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4842 25020 bytes
SHA-256: 4bd6f50f00b6a8c55f6cdd24d72aea589c98cbb686dbb7b543dd0f928ff30615
font_01_sfnt_off0000823f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x823F 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BF0 17976 bytes
SHA-256: 206c578388b9bac3d1752862f80fd049ac7eba4f7fbaab7734ea75c2cf25eb07

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