Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d308bae9edeaf9…

MALICIOUS

PDF

34.7 KB Created: 2021-07-05 19:15:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d05575181bf4e7375d824eab09f06ee0 SHA-1: 5b306d6b368d04691e9b30c30af023ccc71a4ab8 SHA-256: 71d308bae9edeaf9de80fdb3e10e32440c2eda354b743b6fe4c80e641135cdfc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'http://netcdn.tw/app/431946152/free-girl-hair-roblox-game-hack'. This URL is presented as a lure for game hacks and generators, indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/free-girl-hair-roblox-game-hack In PDF document text
    • https://www.sonestad.se/library/repository/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-mod-version-free-download-2021_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/pokemon-go-free-install_GM1094591345.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/60-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/how-to-get-free-gamepasses-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/http-bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/how-do-you-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-robux-codes_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-spins-coin-master-march-2021_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/pubg-uc-zam_GM1330123889.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/wurst-18-9_GM479516143.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-spin-hack-link_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/roblox-loadstring-hack_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/roblox-but_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-roblox-accessories_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/my/tasksIn 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
font_00_sfnt_off00002fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FD4 22916 bytes
SHA-256: 2f0ba752773fe5501723e65722365dbd32a8bb6a4d371f67a71cbea29827dd41
font_01_sfnt_off00006389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6389 18768 bytes
SHA-256: a19482ec217a93b69a90cc40bb32414dc3787cf03cf976b6a89708073ecc5442

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