Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e62a9375c3b2c02…

MALICIOUS

PDF

35.7 KB Created: 2021-06-28 07:54:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 646208798b2a243e2a4dcfb00984d29e SHA-1: 0e0f68ea654cb798e0a346b07c2f90f9d27708a7 SHA-256: 6e62a9375c3b2c0264ebdb0047ec473b4aaf77c541b4325c7bf05ccf41d21850
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free in-game items and hacks to trick users into clicking malicious links. The document contains multiple embedded URLs, including one pointing to a known malicious redirector infrastructure, which likely leads to further malicious content or malware downloads. The ML classifier also strongly indicated maliciousness, supporting the observed redirection and lure tactics.

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.co/app/431946152/free-hat-in-roblox-2021-game-hack In PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/roblox-jailbreak-cheats-or-hacks_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-l-robux-2021-obby_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/roblox-backpacking-hack-script_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/www-coin-master-hack-tk_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/100-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-35-13-hack-download_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/roblox-exploit-download_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-roblox-injectors_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/hack-a-game_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/www-rbx-com_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-coin-link-for-coin-master_GM406889139.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_off00003496.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3496 22244 bytes
SHA-256: f7f67cc9fb9192ec1f4a9e8302b4c0686cd80c365ebd946287ba8e63eac72320
font_01_sfnt_off00006617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6617 19156 bytes
SHA-256: b4dc75c795cc7d38b53a6294a25b82a4ddfd2e8a423d834cc643a85fb070ba6a

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