Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc8ced5e7301da7…

MALICIOUS

PDF

34.7 KB Created: 2021-07-07 00:27:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d489f7698cf193b361819edd968c61b5 SHA-1: 6ce0c1dcdee8caf51838bc5939ab64938d02f3c5 SHA-256: 9bc8ced5e7301da728a0ed940917b82ad5ebc53d4afd821cd7770afb940fe37e
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 cheats. The primary lure appears to be a 'Coin Master Free Shield Link' which leads to a known malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering tactic to drive users to potentially harmful websites.

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.tw/app/406889139/coin-master-free-shield-link-game-hack In PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-free-in-app-purchases-jailbreak_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/fre-click-tp-roblox-script_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/roblox-jailbreak-hack-exploit-free-fly-hack-and-teleport_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/how-to-play-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/roblox-login-hack_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/reddit-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/how-to-get-free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-items-roblox-2021-list_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/roblox-unlimited-robux-and-tix-hack_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-bird-guitar-solo-roblox_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/hack-roblox-para-volar_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/robux-offers_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/roblox-rubux-cheat_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/cool-roblox-shirts-for-free_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
font_00_sfnt_off00003072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3072 23036 bytes
SHA-256: 41bb6165f8cd9b408954179dbc32d432a4c98854c6329f3700b21b382d808b17
font_01_sfnt_off0000643a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x643A 18580 bytes
SHA-256: 28ee47efd6c2d2ec5d8d6e69d99c6b14bf9fd67f9a78f80b4c32aabff95defac

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