Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dbd8ba3e7da03d5…

MALICIOUS

PDF

33.8 KB Created: 2021-07-06 10:34:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 87348cc6e4630904dcfec31f9e8dcb79 SHA-1: beed8856f53a964b70c4ee713af766e39b8fc2a4 SHA-256: 5dbd8ba3e7da03d5849c514c61835a8aef8e5faaa2d4125e03438a398e3351ab
160 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically promoting a 'Coin Master Free Spin Link Game Hack'. The document body and heuristic firings confirm this lure, aiming to trick users into visiting a potentially harmful site. The presence of embedded URLs and the nature of the lure suggest an attempt to deliver a secondary payload or lead the user to a phishing site.

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-free-100-spin-link-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-re_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/is-minecraft-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/cheat-engine-on-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hack-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hacker-de-roblox-00_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-minecraft-account-list_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-spins-twitter_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-often-pubg-uc-flare-up_GM1330123889.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hack-mod-apk-unlimited-spin-download_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-giver_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-rare-cards-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/hack-avatar_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-how-to-get-free-limited-items_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
stream_002_off00002e88.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E88 22448 bytes
SHA-256: f632eb7ce0886bbd0acd156dd6128d6a0f61ef70e7ef244f15f4030c532c5eaf
font_01_sfnt_off00006054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6054 18620 bytes
SHA-256: cfc54751512bc7e110264f73785061a475bf2a76f79571e558b4b9cd93d36ac5

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