Malicious PDF — malware analysis report

Static analysis result for SHA-256 0efb81a23c15cfb2…

MALICIOUS

PDF

34.2 KB Created: 2021-06-28 15:09:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e1e2bd8220c7393703725f8a41a713a4 SHA-1: 88f43f735e1f21da498c7c0d247f92990110850e SHA-256: 0efb81a23c15cfb245ca2ad2216a068f868dbbb86bc86f648eb5b6729b13513c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector leading to a 'game hack' lure. The document body and heuristics indicate a social engineering attempt to trick users into visiting this malicious URL. No scripts were extracted, but the presence of malicious links and the lure suggest a phishing or scam attempt.

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/roblox-shirts-for-girls-free-shipping-game-hack In PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-play-minecraft-with-friends-for-free_GM479516143.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/roblox-free-t-shirt-for-girl_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/roblox-controversy_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-400-spin-link-hack_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/tiktok-fans-free_GM835599320.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-roblox-card-codes_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/robux-only_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-get-free-spins-on-coin-master-2021-links_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/cheat-codes-for-roblox-adopt-me_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/btools-roblox-hack-download-free_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-free-spins-for-iphone_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-time-speed-hack_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-robux-dec-2021_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/roblox-hack-2021-october_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/roblox-cheat-engine-health-hack_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/minecraft-apk-free-download-016-0_GM479516143.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-change-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-minecraft-account-reddit_GM479516143.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_off00002eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EEB 22204 bytes
SHA-256: d2573b6ea51243a990395a5f6069229cb5cf4f04ce99ba7004ac92620d6215cd
font_01_sfnt_off00006030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6030 19216 bytes
SHA-256: 10cdde7293fc18f49259777002f0bccf820581ac3d2c2b2c8bda1a78e905a4ef