Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a89799e047de53…

MALICIOUS

PDF

34.6 KB Created: 2021-07-01 03:08:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4440e844e29c9c419cb5ac3b065a02d9 SHA-1: ac7b30fdec40b47265f57ffecdce6b543c165e3e SHA-256: 82a89799e047de531b14ab7c9bee61dbd1df61a433aafe219fbe5d1580059446
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to websites and other PDFs that promise game hacks and free in-game currency, such as Robux for Roblox. One primary URL, http://netcdn.co/app/431946152/how-to-get-free-robux-in-roblox-without-a-generator-game-hack, is identified as a malicious redirector. The document's structure and content strongly suggest a phishing or scam attempt designed to drive traffic to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.co/app/431946152/how-to-get-free-robux-in-roblox-without-a-generator-game-hack In PDF document text
    • http://achauco.vn/public/upload/files/how-to-add-script-on-roblox-hack_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-online-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-to-get-pokeballs-in-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/archery-master-3d-unlimited-coins-hack_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/roblox-free-model-roller-coaster_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-to-cheat-in-roblox_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-roblox-arsenal-hack-executor_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/my-roblox-account-got-hacked-ant_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/hack-para-roblox-dragon-ball-rage_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-to-hack-a-server-without-getting-kicked-out-roblox_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/without-tiktok-free-fire_GM835599320.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-minecraft-thumbnails_GM479516143.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-to-hack-roblox-games_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_off00002e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E8E 22528 bytes
SHA-256: 5032b71ab72fd8a720d49db0792ee65246fde6886275b791f9c923b31c7a576f
font_01_sfnt_off000060f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60F7 19544 bytes
SHA-256: bacc746f7a3e33024f9122e1cf928edf1bfb387d58b35d449b7eef0259ada81c