Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcef7a647b2ed31c…

MALICIOUS

PDF

35.0 KB Created: 2021-07-07 00:56:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 43aa2102cbfba9f6c1380c2bb9ae607d SHA-1: 832885b88a176ed71e8a06505d669fd5b0449200 SHA-256: dcef7a647b2ed31cc6f3787ae75285f84024f89d352f0503ff139b666f37479e
160 Risk Score

Malware Insights

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

The PDF contains a link to a redirector masquerading as a game hack generator, which is a common lure for malicious downloads. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to exploit user interest in free game resources to redirect them to potentially harmful content or downloads.

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/coin-master-level-3-game-hack In PDF document text
    • https://elearning.min13bm.sch.id/__statics/gudangsoal/files/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • https://elearning.min13bm.sch.id/__statics/gudangsoal/files/coin-master-free-spin-links-december-30-2021_GM406889139.pdfIn PDF document text
    • https://elearning.min13bm.sch.id/__statics/gudangsoal/files/roblox-old-avatar_GM431946152.pdfIn PDF document text
    • http://elearning.min13bm.sch.id/__statics/gudangsoal/files/robux-website_GM431946152.pdfIn PDF document text
    • https://elearning.min13bm.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • https://elearning.min13bm.sch.id/__statics/gudangsoal/files/minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://elearning.min13bm.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://elearning.min13bm.sch.id/__statics/gudangsoal/files/earnrobux_GM431946152.pdfIn PDF document text
    • http://elearning.min13bm.sch.id/__statics/gudangsoal/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.min13bm.sch.id/__statics/gudangsoal/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • https://elearning.min13bm.sch.id/__statics/gudangsoal/files/coin-master-hack-with-facebook-login_GM406889139.pdfIn PDF document text
    • https://elearning.min13bm.sch.id/__statics/gudangsoal/files/slurp-hack-roblox-counter-blox_GM431946152.pdfIn PDF document text
    • http://elearning.min13bm.sch.id/__statics/gudangsoal/files/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • https://elearning.min13bm.sch.id/__statics/gudangsoal/files/play-minecraft-free-online-no-download_GM479516143.pdfIn PDF document text
    • http://elearning.min13bm.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://elearning.min13bm.sch.id/__statics/gudangsoal/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://elearning.min13bm.sch.id/__statics/gudangsoal/files/roblox-hack-build-your-own-boat_GM431946152.pdfIn PDF document text
    • https://elearning.min13bm.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://elearning.min13bm.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://elearning.min13bm.sch.id/__statics/gudangsoal/files/free-roblox-headphones-catalog_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
font_00_sfnt_off00003354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3354 22816 bytes
SHA-256: 4d06a512a01300cf94b743b09994fa7b760142ec5a6d9e48d374a4306b4ec939
font_01_sfnt_off0000666f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x666F 18196 bytes
SHA-256: 04e08f75d0dcb1ff2d1bd5e888b21509a5ecc658ea7bbb2878025403cee5e5ad

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