Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e31784f606e430…

MALICIOUS

PDF

41.0 KB Created: 2021-05-17 12:17:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: bacbe99a1075414b6112797a7756f928 SHA-1: 83da1fcbd46585009286bae052a646ad901be3cd SHA-256: c8e31784f606e430092debaad14ba9e306c6f3ee4426ea4002d5700c5fa90a5d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a primary external URI that are likely part of a lure to trick users into downloading malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of download-related lures reinforces this assessment. While no scripts were directly extracted, the structure and embedded URLs suggest an attempt to facilitate the download of a second-stage payload.

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-create-group-in-coin-master-free-spins-game-hack In PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/roblox-robux_GM431946152.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/hackear-coin-master-espaol_GM406889139.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/coin-master-free-spins-ios-2021_GM406889139.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/free-roblox-premium_GM431946152.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/roblox-account-taker_GM431946152.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/coin-master-hack-facebook_GM406889139.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/how-to-get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/coin-master-free-spins-and-coins-for-today_GM406889139.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/how-to-get-free-hair-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/coin-master-free-link_GM406889139.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/free-roblox-toy-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/coin-mster-free_GM406889139.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/coin-master-hack-android-no-root_GM406889139.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/coin-master-free-coins-facebook_GM406889139.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://www.alamrayabali.com/assets/CKImages/files/coin-master-hack-co_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_003_off000047cc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47CC 23876 bytes
SHA-256: 6f219de2044fb1ff0bc1b77f4288fa423f8634e3e49d760a3b483ae71593d319
font_01_sfnt_off00007df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF3 18188 bytes
SHA-256: 214f541c49ef2ca421d67462486d7476b6aace0078e47079ad7f1e2427fd8839

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