Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd8199b8e8d2399…

MALICIOUS

PDF

48.3 KB Created: 2021-06-11 08:14:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3f26cb70083afee2f82f618417f0905e SHA-1: 346e486721ed64041495091a2af399725321e8ad SHA-256: 9bd8199b8e8d2399b0adb17db343f7b3c13eae3d8a2e6d8df324ead4c1be8222
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous links to external websites, many of which are disguised as game hacks or generators for popular games like Roblox and Minecraft. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a coordinated effort to direct users to potentially malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.tw/app/431946152/roblox-app-free-apk-game-hack PDF link annotation
    • http://reggieslockandkey.com/images/roblox-avatar-com_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/minecraft-pocket-edition-free-ios_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/raindrop-hack-for-roblox_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/minecraft-creative-mode-free_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-roblox-clothes-boy_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/best-way-to-get-robux_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-to-get-free-robux-by-watching-ads-2021_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-toy-codes-roblox_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-spins-coin-master-october-17-2021_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/moonactive-free-spins-link_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-spins-generated-from-coin-master_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-link-daily-get-free-spins-and-coins_GM406889139.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_off00005299.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5299 24876 bytes
SHA-256: 0740319e7d5bca750d80f4917b020ebcd934afac113d55e35c215555f4815811
font_01_sfnt_off00008a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A74 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off0000971c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x971C 19176 bytes
SHA-256: 82a797d3b3721e22a8ca4d61395958c7d6a3e99038d83d59605b722b6210c9ed

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