Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a77b154a314f17…

MALICIOUS

PDF

41.5 KB Created: 2021-05-17 06:14:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 557f1a09c9752d0b5b6e365695cdad2f SHA-1: 0581a277591043269eb2fb9d364a31897b73fec0 SHA-256: e1a77b154a314f17cc79ceee3415d393f2657ecadb5b3f00009a1c04a79e4867
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting "free generators" and "hacks" for popular games. The primary lure URL is https://netcdn.xyz/app/406889139/coin-master-apk-hack-2021-ios-game-hack, which is associated with a known malicious redirector. The document body, though partially obfuscated, also contains numerous links to other PDF files hosted on mbbs.hr, likely serving as further lures or part of a download chain.

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/coin-master-apk-hack-2021-ios-game-hack In PDF document text
    • https://mbbs.hr/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/robux-win_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-accounts_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/minecraft-pe-hacked-client-download_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-coins-link-2021-deutsch_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-hack-online_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-2021-spin-link_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_off00004883.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4883 24236 bytes
SHA-256: f1783acc4cc6373c1e0e69efed412862f6966994382e4f9d16cbd43def0443a8
font_01_sfnt_off00007fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FAC 18296 bytes
SHA-256: 279b0b1c893eba727ec0845632f3a3712edc40ddf848fb82c48fddf2681f3228

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