Malicious PDF — malware analysis report

Static analysis result for SHA-256 9880352f7f33dfaa…

MALICIOUS

PDF

35.1 KB Created: 2021-07-06 12:10:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c02eb4f18978279655997226a797ed79 SHA-1: 126e9bce3b5f2a8495ecc0f4b4a9b73457ff14e1 SHA-256: 9880352f7f33dfaa44220086160b2055bcdefdf14909e9603b1b9eaddd913c0d
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 a 'game hack' or 'free coins' lure. The document body and heuristics confirm the intent is to drive users to the malicious URL. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a potential for client-side exploitation or redirection to a malicious site.

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-coins-and-spins-link-today-game-hack In PDF document text
    • https://resmed.ear.com.tw/image/data/files/how-to-make-a-roblox-script-hack_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/can-you-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/pokemon-go-free-or-james_GM1094591345.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/coin-master-pc-hack-tool_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/app-hacks-para-roblox_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/where-to-get-robux_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/guide--coin-master-free-tips_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/roblox-hack-2021-robux_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/coin-master-free-link-blogspot_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-robux-just-by-watching-videos_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/coin-master-heaven-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/coin-master-free-spins-no-verification_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/roblox-theme-park-tycoon-2-money-cheat_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/roblox-mad-city-hack-pastebin_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/oprewards-login_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_off0000311d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x311D 23224 bytes
SHA-256: 20c8823be0119d076d2916197d959c690119f316275096b2479baf20e8c10d95
font_01_sfnt_off00006516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6516 18696 bytes
SHA-256: 31669538ff40287ff7f58bdcd26457d43685aec4be0ef4186bcc350705393131

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