Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6561bf03f95243f…

MALICIOUS

PDF

35.5 KB Created: 2021-07-05 19:43:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8439801ec0e20780d42eb2c472f9b4af SHA-1: e1486985bdb777154d1d2f947619460296720918 SHA-256: a6561bf03f95243f23b323ec80a067ff93b82d7e1a0b4f2c162c1dc346e99ea0
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to websites offering game hacks and free currency, such as 'coin-master-free-spins-hack-but-no-surveys-game-hack'. These links are hosted on known malicious redirector infrastructure, indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-free-spins-hack-but-no-surveys-game-hack In PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/hacker-roblox-games_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/brick-cars-cheat-codes-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/roblox-project-pokemon-how-to-get-mewtwo-cheats_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/flip-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/minecraft-pc-download-free-full-version_GM479516143.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/coinmaster-free-spins-link_GM406889139.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/how-to-hack-denisdaily-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/free-robux-easy-steps_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/roblox-watch-ads-for-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/roblox-gang-rape_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/cracking-websites-roblox-hacking-websites_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/comment-utiliser-cheat-engine-sur-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/how-to-get-18-000-robux-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/how-to-get-a-free-vip-server-on-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/how-to-get-free-robux-hacks-online_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_002_off00003262.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3262 23024 bytes
SHA-256: fd7b850483f384f5e111dc5645bfb110b0926e72ae2b3b770574c5405607b9d1
font_01_sfnt_off00006620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6620 18992 bytes
SHA-256: 97804845bf467d2aeff7c85d47b4467823aac43885222e40ee61a94876ec16b2

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