Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a0f78c843a44e2…

MALICIOUS

PDF

45.6 KB Created: 2021-06-06 23:28:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: cfbe403217df8a8910601b18d40d743e SHA-1: 135fdc0e3a66f2ce2320a5dd3eeaa282b42b67f1 SHA-256: 62a0f78c843a44e2b20268fa2eeed32e35a50c4fb85fd56167c4ab2527c18710
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The primary redirector URL is https://netcdn.tw/app/431946152/free-roblox-online-game-for-windows-7-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering attack aimed at tricking users into visiting malicious sites, likely for further payload delivery or credential harvesting.

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.tw/app/431946152/free-roblox-online-game-for-windows-7-game-hack In PDF document text
    • https://www.library.kysm.edu.my/repository/coin-master-free-spins-ios_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/coin-master-instagram-free-spins_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/robux-survey_GM431946152.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/100-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/coin-master-free-spin-links-december-30-2021_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/roblox-play-as-guest-free_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/coin-master-hack-tool-generator_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/free-roblox-printables_GM431946152.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/minecraft-free-download-android_GM479516143.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/coin-master-hack-2021-apk_GM406889139.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_off00004d52.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D52 27332 bytes
SHA-256: 1c29970e3c1f1ad9e24392714449ad08607426b1921cec52a7d58f70f817f981
font_01_sfnt_off00008cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CDD 19148 bytes
SHA-256: fa2a9bad75fccc3cb53962bb6bb32f33183d8b267bfa9b99bbcf84746452979c

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