Malicious PDF — malware analysis report

Static analysis result for SHA-256 8248c4bc86b5201a…

MALICIOUS

PDF

44.8 KB Created: 2021-06-08 18:22:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 91fc1038feaa43d5cadd428a08ad7ef5 SHA-1: c966e2857922ac0c8c5f5cfcf1c9279f6572e45c SHA-256: 8248c4bc86b5201a78839c96142cd8281475cc0a85c2d974c9f6468ee7152cfa
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting game hacks and in-game currency. The primary lure is for 'Roblox' account hacks, directing users to a URL hosted on netcdn.tw. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack designed to lead users to potentially harmful content or further malware downloads.

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.tw/app/431946152/how-to-hack-roblox-accounts-mobile-game-hack In PDF document text
    • http://neltalen.nl/images/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/free-coins_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/tiktok-free-wala-video_GM835599320.pdfIn PDF document text
    • http://neltalen.nl/images/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/i-cant-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/tiktok-followers-for-free_GM835599320.pdfIn PDF document text
    • http://neltalen.nl/images/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/roblox-headless-horseman-free_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/coin-master-hack-apk-35-18_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/free-robux-obby_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/roblox-wood-tycoon-2-cheats_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005229.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5229 24852 bytes
SHA-256: c770d7a120f8902a23a57db6f6bbcbda03f89465bcc511a537fa3035c545acdd
font_01_sfnt_off00008aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA8 18904 bytes
SHA-256: 7991335c6b6727c7c9a7fbeacdda31381146523e3d1ac46fee57fab999e25115

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