Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ba3e18dde4a1a1…

MALICIOUS

PDF

34.4 KB Created: 2021-07-06 09:31:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8269bbecbac57b97f65b8a11d4b28c02 SHA-1: 09914545e9966702c90b0a5b2eae2af576200e8a SHA-256: f1ba3e18dde4a1a178783cd7ce6ea18bd50bd7ad1652cdcfaca135411b47201f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains multiple links to malicious redirectors, disguised as offers for game hacks and free currency. The primary link, http://netcdn.tw/app/406889139/free-spins-coin-master-no-verification-game-hack, is flagged as malicious. The document body and heuristics indicate a lure for users to click these links, likely leading to further malicious content or exploits. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/free-spins-coin-master-no-verification-game-hack In PDF document text
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/com-roblox_GM431946152.pdfIn PDF document text
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/coin-master-free-spins-and-coins-generator_GM406889139.pdfIn PDF document text
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/claimrobux-net_GM431946152.pdfIn PDF document text
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/free-minecraft-java-account_GM479516143.pdfIn PDF document text
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/cheat-engin-robux_GM431946152.pdfIn PDF document text
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/coin-master_GM406889139.pdfIn PDF document text
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/cheat-paintball-roblox_GM431946152.pdfIn PDF document text
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/how-to-get-free-robux-always-works_GM431946152.pdfIn PDF document text
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/hacker-in-roblox-deutsch_GM431946152.pdfIn PDF document text
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/pasos-para-hackear-coins-master_GM406889139.pdfIn PDF document text
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/free-h-robux-aniversery-giveaway_GM431946152.pdfIn PDF document text
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/roblox-link-free-robux_GM431946152.pdfIn PDF document text
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/best-site-for-free-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/free-robux-accounts-28-october-2021_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_off00003186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3186 22524 bytes
SHA-256: f0dfc31af34688090795e5961233c08267ba714f38b96c6cb331f29c1df86836
font_01_sfnt_off000063cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63CB 18308 bytes
SHA-256: 63d46e2fc11b5f381c18d1546a8cbb42f040e681088ff612efa24a789ab3d44b

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