Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6ac48aa4bf4c7e…

MALICIOUS

PDF

46.3 KB Created: 2021-06-07 10:48:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f57187493303a922137f47e0d803c3c1 SHA-1: 02620719f91c81f92d62a14f6315a16fa0dd13d9 SHA-256: da6ac48aa4bf4c7e2bbc99ce66c6161f7564626ea9a2ad0f0b8a6edec754abd5
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites offering game hacks and free currency, a common lure for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a malicious intent to drive traffic to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/hack-to-beome-supertall-in-roblox-game-hack PDF link annotation
    • http://bit-sky.com/images/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/extra-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/free-minecraft-shaders_GM479516143.pdfIn PDF document text
    • http://bit-sky.com/images/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/free-robux-app_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/why-is-tiktok-free_GM835599320.pdfIn PDF document text
    • http://bit-sky.com/images/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/coin-master-game-2021-free-spin-link_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/coin-master-hack-spin-160-pro_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/app-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • http://bit-sky.com/images/how-to-get-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/free-coin-master-game_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/how-to-get-free-roblox-money_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_off0000506b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x506B 28920 bytes
SHA-256: 359e1e3a27dd86a4cbc35f5bfbf3a42fd3731959fb50c3fbcc80807e3b47933b
font_01_sfnt_off000090b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90B5 18864 bytes
SHA-256: 5c435d4468a4b81fbe035f6a9af6bee4cd684f02b274731cf8cb77027ea80307

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