Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b15db6d53fa54a…

MALICIOUS

PDF

41.7 KB Created: 2021-05-14 14:31:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b6b1d44a03a29d72f7a90820ec414f0a SHA-1: bce4ace1db67fe5964b8f3b9475096a2ccd8629c SHA-256: a3b15db6d53fa54ab251feed8986451c1bf1f872c88effb1cb8c42d588c8a0cf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a domain known for hosting malicious redirectors, specifically advertising 'game hacks' and 'free currency'. The document body, though partially corrupted, contains a URL that matches the malicious domain identified by heuristics. This indicates a social engineering lure to drive users to potentially malicious content or further downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/how-to-generate-free-coin-master-spin-game-hack In PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/coin-master-spin-ml-link_GM406889139.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/hacks-minecraft_GM479516143.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/coin-master-time-hack_GM406889139.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/minecraft-pe-hacks-2021_GM479516143.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/minecraft-hax-download-no-virus_GM479516143.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/minecraft-hacks-pc_GM479516143.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/hack-coin-master-site-rssingcom_GM406889139.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/claim-roblox_GM431946152.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/coinmaster-twitter_GM406889139.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/can-you-get-minecraft-for-free-on-pc_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_003_off00004886.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4886 24924 bytes
SHA-256: a4242610b112e8798437ce5cf5a78987b37563c88289f708292ba80dc618757b
font_01_sfnt_off0000815a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x815A 18052 bytes
SHA-256: bc7397b7892e84f8f438cdf02f94402a75785e8c4a68cee0805b100b0e31cd84

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