Malicious PDF — malware analysis report

Static analysis result for SHA-256 797f77935493003f…

MALICIOUS

PDF

45.6 KB Created: 2021-06-03 17:56:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1baa7d5d4dd8569529f1af39863e8b33 SHA-1: bbbba6014db2ad92ae8e5c2ab629dc93cfe7d566 SHA-256: 797f77935493003f67e3d8e462179ffadeb9ecd18de31f80532573dbe9c0a7c6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting game hacks and currency generators. The heuristic firings indicate these links are associated with known malicious redirectors and lures for game-related exploits. While no scripts were explicitly extracted, the embedded URLs and the nature of the lures suggest an attempt to drive users to potentially malicious websites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.online/app/406889139/coin-master-mod-version-free-download-34-4-game-hack In PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-daily-gift-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-hack-8-ball-pool_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-free-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-hack-spin-link_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-free-skins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-views-tiktok_GM835599320.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/levvvel-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-codes-generator-no-verification_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_004_off0000525f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x525F 26032 bytes
SHA-256: b9e308c7483bb91ef94673a9252ee128abf50cbe646eedba955f400fc038c55b
font_01_sfnt_off00008e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E43 18660 bytes
SHA-256: d54d0df51cc985c44903bf11817fdc05ae06a63865837b52584f64bec6a13db8

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