Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d1b80dbde1e3ab0…

MALICIOUS

PDF

34.7 KB Created: 2021-06-26 03:14:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3a52764148eab888814c5fef9d89dd50 SHA-1: e20f9879be7a72ea3466fd37c1563bd1f1c08d98 SHA-256: 9d1b80dbde1e3ab05daeb383e07a4fab957748075c5fefcb5f848cd2f9cd3b2a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for game hacks and redirects to known malicious infrastructure. The embedded URL 'http://netcdn.co/app/431946152/how-to-get-free-hats-on-roblox-2021-game-hack' is identified as a malicious redirector. The document body, though partially garbled, contains similar lure text and URLs, reinforcing the malicious intent. No scripts were extracted, but the primary attack pattern involves social engineering via a deceptive link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/how-to-get-free-hats-on-roblox-2021-game-hack In PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-free-spins-android_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-robux-scams_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/roblox-private-plane-free_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-to-get-minecraft-for-free-on-xbox_GM479516143.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-spin-coin-master-instagram_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-free-spin-reward-links_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-mod-apk-coin-master_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-robux-dezs-nuts_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-spin-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/tiktok-free-views_GM835599320.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-to-become-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-hack-ios-2021_GM406889139.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
font_00_sfnt_off00002fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FCA 22320 bytes
SHA-256: c16d213d52de3b72154bb262e9fec64684159c2e0a2d52a4fe11bdbd5a7197ef
font_01_sfnt_off00006181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6181 19320 bytes
SHA-256: 96f9b4ae0ddef397a93c0f32eb741b3d4413d6ad1c3ccb0b4b12c130eca8cf2e

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