Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf32006408052f2…

MALICIOUS

PDF

45.5 KB Created: 2021-06-10 21:38:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 818953b7bbabc7d944f67af48d4b088f SHA-1: be13cb57666b41c029bd55355563ad9141552f2b SHA-256: 1bf32006408052f2f1b32c051168c6a7c1fdca5f6eecd9c43946450a05bc6a35
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising free game currency and hacks. The document body, though partially corrupted, contains text related to 'free Robux' and 'game hack', reinforcing the lure. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves redirecting users to malicious infrastructure, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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-on-tablet-2021-game-hack In PDF document text
    • http://foo.com.tw/files/100-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/roblox-sex-cheat-code_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-free-spins-link-download-for-iphone_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/krnl-roblox_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-hack-ios-reddit_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/free-minecraft-shaders_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-free-spins-link-2021-march_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/best-hacked-client_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/free-tiktok-followers-no-human-verification-or-survey_GM835599320.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-a-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/get-minecraft-windows-10-free_GM479516143.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_off0000508a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x508A 25952 bytes
SHA-256: 6a2b441a235e8a168ea4a255b17e789a5f23f06f4a0598dfdaf10b2314158f4a
font_01_sfnt_off00008cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF8 18988 bytes
SHA-256: 01c922a5f6bc440278eecadc2e4e29245016a2d7b90b714d85374ce526f712c0

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