Malicious PDF — malware analysis report

Static analysis result for SHA-256 a215b7b9ef6b0707…

MALICIOUS

PDF

44.7 KB Created: 2021-06-07 17:41:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3058c894a6a876ad44adde2f0045f23c SHA-1: a30c97ceb4fbc6fc8bbd9d0b45b3986d9d849790 SHA-256: a215b7b9ef6b070770e33a5b7130fb8f8a30b74cbbddc0568f6a8a3147fe83d7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple heuristics indicating it links to malicious redirectors, specifically promoting 'free generator' and 'game hack' lures. The embedded URL https://netcdn.tw/app/431946152/how-to-get-free-robux-actually-2021-game-hack is identified as a malicious redirector. The document body, though partially corrupted, contains text related to 'Free Robux' and the same URL, reinforcing the lure. No scripts were extracted, but the primary attack pattern involves social engineering via a deceptive link.

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-get-free-robux-actually-2021-game-hack In PDF document text
    • http://balkanin.com/images/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://balkanin.com/images/do-coin-master-hacks-work_GM406889139.pdfIn PDF document text
    • http://balkanin.com/images/coin-master-blogspot-links_GM406889139.pdfIn PDF document text
    • http://balkanin.com/images/games-in-roblox-that-give-you-robux_GM431946152.pdfIn PDF document text
    • http://balkanin.com/images/moonactive-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://balkanin.com/images/coin-master-apk-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://balkanin.com/images/free-roblox-followers_GM431946152.pdfIn PDF document text
    • http://balkanin.com/images/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • http://balkanin.com/images/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://balkanin.com/images/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://balkanin.com/images/pokemon-go-free-walk-ios_GM1094591345.pdfIn PDF document text
    • http://balkanin.com/images/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://balkanin.com/images/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • http://balkanin.com/images/coin-master-free-spins-cash_GM406889139.pdfIn PDF document text
    • http://balkanin.com/images/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://balkanin.com/images/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://balkanin.com/images/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • http://balkanin.com/images/free-roblox-animations_GM431946152.pdfIn PDF document text
    • http://balkanin.com/images/minecraft-pe-free-ios_GM479516143.pdfIn PDF document text
    • http://balkanin.com/images/apps-to-get-free-robux_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_off00004ebc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EBC 25456 bytes
SHA-256: 40e979c041b0bb3090d68d09abc56e33542c483d4c4f20e0c989397e1d9c90c2
font_01_sfnt_off0000890c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x890C 19164 bytes
SHA-256: 05fea53183f92ca746d2fc01c7146127f880973f3fa2cc55e4d09558800116bd

Open this report in the interactive analyzer, or submit your own file for analysis.