Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee166e782fc923a9…

MALICIOUS

PDF

46.6 KB Created: 2021-05-16 22:03:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 858dcefe073e831e0e22f9c1528d0848 SHA-1: af4c610c9d803e871b358e995b9d457d72dfbcc6 SHA-256: ee166e782fc923a9e45d48b4b86bc60f7e26120919c906218b6bc065184edf33
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links, specifically targeting users with lures for 'free Robux' and 'game hacks'. The document body, though heavily obfuscated, contains a URL that aligns with these lures. The embedded links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/431946152/how-do-i-get-free-robux-game-hack In PDF document text
    • http://classicskitours.net/images/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://classicskitours.net/images/free-multiplayer-minecraft-server_GM479516143.pdfIn PDF document text
    • http://classicskitours.net/images/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://classicskitours.net/images/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://classicskitours.net/images/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://classicskitours.net/images/roblox-girl_GM431946152.pdfIn PDF document text
    • http://classicskitours.net/images/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://classicskitours.net/images/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://classicskitours.net/images/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://classicskitours.net/images/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://classicskitours.net/images/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://classicskitours.net/images/coin-master-hack-september-2021_GM406889139.pdfIn PDF document text
    • http://classicskitours.net/images/minecraft-free-computer-game_GM479516143.pdfIn PDF document text
    • http://classicskitours.net/images/roblox-girl-avatar_GM431946152.pdfIn PDF document text
    • http://classicskitours.net/images/master-free-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://classicskitours.net/images/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://classicskitours.net/images/minecraft-bedrock-free-download_GM479516143.pdfIn PDF document text
    • http://classicskitours.net/images/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://classicskitours.net/images/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://classicskitours.net/images/flip-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004921.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4921 26176 bytes
SHA-256: 95bca7292a96455d0aeedc61270c614307830db2b00dd81f24e6edce6c915e7c
font_01_sfnt_off00008610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8610 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9321 18452 bytes
SHA-256: af4dc877dda7dbd9aa71ce66d9a52868b07d358fe63790b9b74aede2acb33558