Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe0716cbeed7263…

MALICIOUS

PDF

48.6 KB Created: 2021-06-11 13:23:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 17342ae1f5fb63125e8f2c8c3710ace4 SHA-1: 1bbd5a1c231e2d392970ae55f257eff000ac4dfa SHA-256: efe0716cbeed72633ba4df39849a4d033dd1bbf05392cbd2ed2ffa2654528a95
160 Risk Score

Malware Insights

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

The PDF contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free unlimited no wait robux game hack'. The document body, though heavily obfuscated, contains references to the same lure and the malicious URL. This indicates a phishing attempt to redirect users to potentially harmful content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/free-unlimited-no-wait-robux-game-hack In PDF document text
    • http://muslib.unmus.ac.id//repository/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-spins-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/easy-robux-today_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-free-pets_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-116-1-download_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/como-hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-hack-root_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-mafia-cloth-for-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/minecraft-linux-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/hack-coin-master-using-cheat-engine_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-spins-ios-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/infinite-robux_GM431946152.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_off00005104.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5104 27068 bytes
SHA-256: 9dcc7cb554d070b38ca1d6ea7f40303ef9b700536fc5b3b8786e120baae23159
font_01_sfnt_off00008e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E30 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off0000981b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x981B 19356 bytes
SHA-256: 08455c73155426afb158ed79d2611368d8a284337abebd54b518d7f853782e90

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