Malicious PDF — malware analysis report

Static analysis result for SHA-256 4057d950107fd879…

MALICIOUS

PDF

43.7 KB Created: 2021-06-03 16:25:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8468d25bc9f6e9a4ce1e3f40ef3c6ba2 SHA-1: 00f7648f26e69f01d120bf01b6db75700fc2fd43 SHA-256: 4057d950107fd87933f9f71d981a74f2103d524e7a36e5c432e5c47df1eb7ed7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains links to a known malicious redirector disguised as a game hack generator. The document body, though heavily obfuscated, contains references to similar lures and the primary malicious URL. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/1094591345/pokemon-go-free-box-game-hack In PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/roblox-2021-hack_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-coin-hack_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/minecraft-bedrock-edition-download-pc-free_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-offline-hack_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-download_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-free-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-free-spin-app-reviews_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-facebook-hack_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/tiktok-free-view-iphone-video_GM835599320.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-hack-without-verification_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_004_off0000510f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x510F 24284 bytes
SHA-256: 7035c6c56fe0bd81345a41545a46a803792e12eab643def6146109b70f9f629a
font_01_sfnt_off00008899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8899 18268 bytes
SHA-256: 50b669127b667187020578e7a6af3f869367f80098e5cf3c206fe13e33e267e6

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