Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b7c95148071418…

MALICIOUS

PDF

46.1 KB Created: 2021-05-12 02:29:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7d267d0085c28751747d8db293dcbcdb SHA-1: 7420988a8f7f4de0b247700b920779db1d67aea6 SHA-256: 90b7c9514807141893aa4db74e5182f4027b4fc0cdf6897f51dd54cd4e17f749
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as "free generator" or "game hack" lures. The document body and embedded URLs promote various game-related cheats and currency, aiming to trick users into clicking through to malicious infrastructure. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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.xyz/app/479516143/free-minecraft-server-hosting-24-7-game-hack In PDF document text
    • http://techmobil.pl/images/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/coin-master-free-online-game_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/rbx-hut_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/coin-master-unlimited-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/hack-coin-master-1_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/free-coins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/flame-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-change-your-username-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-make-a-server-in-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://techmobil.pl/images/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004e4e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E4E 25196 bytes
SHA-256: 00fba3fcf4c1ef9356bf93a3c8d026af9dd6aa6c7330aff027d220050c2391a4
font_01_sfnt_off00008780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8780 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off0000918f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x918F 18352 bytes
SHA-256: 91a7490c887560cf1db9cb18ebb1e2a98db2d1ca6a1740dfb9f9cb38742cb9c1

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