Malicious PDF — malware analysis report

Static analysis result for SHA-256 1daff877965b59ee…

MALICIOUS

PDF

34.1 KB Created: 2021-07-04 20:32:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9f26e0608f8d8f95fa9b3537f5892202 SHA-1: 15b65afd029108b787ba47168341e448b22dae49 SHA-256: 1daff877965b59ee6588a1bdf164dc670f89feb474d7bd357cfb390bc51c9776
160 Risk Score

Malware Insights

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

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising 'free generators' or 'hacks' for popular games. The primary redirect URL is http://netcdn.tw/app/406889139/real-working-coin-master-hack-game-hack, which is flagged as a known malicious redirector. The document's content and embedded links strongly suggest a social engineering lure to trick users into visiting potentially harmful sites, likely for credential harvesting or malware delivery.

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/real-working-coin-master-hack-game-hack In PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/earn-robux-com_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/cheat-engine-roblox-65_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/minecraft-games-free-to-play-online_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-get-free-pokeballs-in-pokemon-go_GM1094591345.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-hack-download-2021_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/chromebook-hacks-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-100-robux_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-free-spin-trick_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/money-hack-sur-sunset-city-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-roblox-groups_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/facebook-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-just-put-in-your-password_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-make-your-own-minecraft-pe-server-for-free_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_002_off00002fb4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FB4 22688 bytes
SHA-256: f9401b5bb57c8c2379f535b6617ae6f456a7a9e93d97bbf3f59af77736fa435f
font_01_sfnt_off00006292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6292 18276 bytes
SHA-256: 6af67ab231adcdd307a15a6a4f5ae357b0ac924b8d59694997f1e905b533e36c

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