Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1c7e16253d7693…

MALICIOUS

PDF

35.8 KB Created: 2021-07-16 06:08:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ccf6409877c8f22ab0f4c92db2c93c99 SHA-1: 8875a1edfc32533ff9453e553f57aeeedd514d48 SHA-256: 9b1c7e16253d769350ec1dffa397b41a5e491031be9592d171ce68167c221d31
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector, specifically http://netcdn.tw/app/406889139/coin-master-hack-ios-apk-game-hack, which is disguised as a game hack generator. The document body and embedded URLs reinforce this lure by referencing game hacks and free in-game currency. This indicates a social engineering tactic to trick users into visiting malicious infrastructure.

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 http://netcdn.tw/app/406889139/coin-master-hack-ios-apk-game-hack In PDF document text
    • https://elearning.mtsn1kabbekasi.com/__statics/gudangsoal/files/how-to-change-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1kabbekasi.com/__statics/gudangsoal/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1kabbekasi.com/__statics/gudangsoal/files/coinmaster-com_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1kabbekasi.com/__statics/gudangsoal/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1kabbekasi.com/__statics/gudangsoal/files/2021-robux-free_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1kabbekasi.com/__statics/gudangsoal/files/free-links-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1kabbekasi.com/__statics/gudangsoal/files/how-to-hack-pokedigerone-in-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1kabbekasi.com/__statics/gudangsoal/files/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1kabbekasi.com/__statics/gudangsoal/files/how-to-get-free-robux-on-roblox-on-pc_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1kabbekasi.com/__statics/gudangsoal/files/free-roblox-app_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
stream_002_off000035dd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35DD 23588 bytes
SHA-256: c22c702803375c5e994726e7031691d3486288aef4bbf445d654c6cc6dc9de6d
font_01_sfnt_off00006b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B57 17892 bytes
SHA-256: c18f05485291fd9dd2d982fa815b69c2a1f9afc9df9b250f8ccfc4cbb8514acf

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