Malicious PDF — malware analysis report

Static analysis result for SHA-256 163bf3b2269159e6…

MALICIOUS

PDF

34.9 KB Created: 2021-07-04 18:05:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f21f7e49656487d959920467b1a630e3 SHA-1: 4b958698d14581af56368e2804fe21ca8157cbe9 SHA-256: 163bf3b2269159e6af0788ec5d94b3dc6bbc03d6698e020c5eded9ebccd56d50
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and lures users with promises of free game items, such as 'minecraft-pe-015-0-apk-free-download-game-hack'. The ML classifier strongly indicated maliciousness, and the presence of redirector links suggests a multi-stage attack aiming to deliver further malicious content or phishing pages. No scripts were extracted, but the document structure and embedded URLs are sufficient to infer a malicious intent.

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/479516143/minecraft-pe-015-0-apk-free-download-game-hack In PDF document text
    • http://library.imz.or.id/repository/roblox-how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/avatar-the-last-airbender-roblox_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/hack-coin-master-343-apk_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-robux-using-cheat-engine_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/how-to-get-10-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-roblox-ad_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/minecraft-handbook_GM479516143.pdfIn PDF document text
    • http://library.imz.or.id/repository/uncopylock-free-robux-wait-for-24-hours-for-your-robux_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-minecraft-server-maker_GM479516143.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-coins-for-flip-master_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/pig-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/roblox-backpack-free_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/play-roblox-free-online_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • http://library.imz.or.id/repository/how-to-speed-hack-in-roblox-mobile_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/minecraft-hacks-pc_GM479516143.pdfIn PDF document text
    • http://library.imz.or.id/repository/account-hacked-on-roblox_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_off00003115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3115 22100 bytes
SHA-256: c1536d4ff14a7df433be1c2f823217d4094f701658f7c8aeb68d0461f86014a5
font_01_sfnt_off00006201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6201 19488 bytes
SHA-256: 5fbcc03ade207b067edfd8a0e3d4a08d604425caf55cf27b07311d1a51fe3a21

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