Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a73684d7a91ae5…

MALICIOUS

PDF

46.2 KB Created: 2021-06-03 23:04:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 32556eca11458219a2fae352d01d318a SHA-1: acbc4ee71071db1f5ab06e57777508352ff8b128 SHA-256: 16a73684d7a91ae5f7c78b2f6741ffcbbc9144f17cc24d2462b9d5cb950bab42
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically promoting a "coin master spin link" lure. The document body, though partially obfuscated, contains similar URLs and text, reinforcing the phishing attempt. The primary goal appears to be directing users to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.online/app/406889139/coin-master-spin-link-2021-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-tricks_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-hack-ios-no-human-verification_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-avatar-maker-free_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-unlimited-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/i-need-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-pro-tiktok_GM835599320.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-link-deutsch-ios_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-coin-master-spins-no-human-verification_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
stream_004_off0000537a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x537A 28304 bytes
SHA-256: 42cb87b07942d16bc8d885ed40cc371cfbed9a736e49102abaa64eb4a78f4b76
font_01_sfnt_off0000920f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x920F 18296 bytes
SHA-256: 4d418bd0c3b206d46989616f0b8a308c7c696a7f242422ad22f1dcb8034b6313

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