Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbfb2bae695ba2b1…

MALICIOUS

PDF

35.4 KB Created: 2021-07-08 10:21:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 79bad3dab51e32d61ef16e0461578cc1 SHA-1: 48f632d565933ccd87d9d2d976525acdfde10bec SHA-256: cbfb2bae695ba2b184025ecb03ef4e9beeb189dc33e8a1aa688781e9d4d53e90
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game hacks and generators to trick users into clicking malicious links. The embedded URLs, such as http://netcdn.tw/app/406889139/coinmasterfree-game-hack, lead to known malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect users to potentially malicious sites for further exploitation or malware delivery.

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/coinmasterfree-game-hack In PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/minecraft-18-9-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/is-coin-master-free_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coinmaster-twitter_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-hack-app-android_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/synapse-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/hack-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/roblox-jailbreak-how-to-get-unlimited-free-jailbreak-money_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/bug-me-not-free-account-roblox_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/join-my-roblox-group-for-free-robux_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-spins_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-online-hack-download_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3300 23512 bytes
SHA-256: b40405fd5c63af5872c87fab1aec1d444c3fe01dc85a90428b6e2b87ac50225b
font_01_sfnt_off0000683b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x683B 18092 bytes
SHA-256: e3b824c700fc1afb9be61c0fda879df8bb3fefe3698910b387f7b25b5267b414

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