Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4f56ff1b9178ed…

MALICIOUS

PDF

48.3 KB Created: 2021-06-03 16:16:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 600c6e93c4f0dd7b2a31286a6f09f00d SHA-1: a3c61de598eddacd8cc43a272deb6eac1c16f491 SHA-256: 9b4f56ff1b9178ed69eae20316a2a89c44c683fd02ac476b822264c580386775
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack lure, directing users to a known malicious redirector URL. The document body also contains the same URL, reinforcing the malicious intent. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious document designed to trick users into visiting a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.online/app/479516143/minecraft-java-edition-free-download-game-hack In PDF document text
    • https://www.andrology.co.uk/uploads/files/files/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-tiktok-followers-without-verification_GM835599320.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-hack-review_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-minecraft-skins-girl_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/earn-free-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/rbx-free_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coins-master_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-free-spins-daily-fb-champion_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/spin-coin_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/pubg-uc-redeem-code-generator_GM1330123889.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-spin-coin-master-online_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/is-minecraft-java-edition-free_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_004_off000054c6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54C6 25908 bytes
SHA-256: 2b95f8a2152115aac7da7f7da60125de95475f51c5510a7e1d55e7d6a81dc574
font_01_sfnt_off00008fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FC1 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off00009961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9961 18572 bytes
SHA-256: be0be2e0bd1478f571662982334261f36152068b9a395b749ff064ff651796b1

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