Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2ca0c34721b892a…

MALICIOUS

PDF

46.3 KB Created: 2021-06-03 06:04:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 184f0d290e60af4766cc1164179e4c2f SHA-1: 72ad51883fe27ea9d69131a64e52714b8cf8f07d SHA-256: f2ca0c34721b892a09cc00acb0db6cee83a17d368c5740a3f9c75f60c90c76c1
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically promoting 'free generators' and 'game hacks' for popular games. This is a classic lure used in phishing campaigns to entice users to click on malicious URLs. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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) or Microsoft license-boilerplate 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.online/app/431946152/free-fighting-roblox-game-game-hack In PDF document text
    • https://lib-stie.yai.ac.id/repository/hack-coin-master-32-mod-apk_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-to-roblox-card_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-roblox-toy-codes-not-used_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/minecraft-iphone-free_GM479516143.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/well-hack-robux_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/tiktok-free-folowers-75_GM835599320.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/earn-free-robux_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-hack-us_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_004_off00005140.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5140 28136 bytes
SHA-256: 56120aff17c83f25bcb142bfb9c7a7a8ae8032f5aa5648b2254eb03f91dfbe0a
font_01_sfnt_off00009057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9057 19112 bytes
SHA-256: 38d396b3b54d77ce1aed7333e35168a3510b4bc449e8bbcda7206f679969eb6f

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