Malicious PDF — malware analysis report

Static analysis result for SHA-256 61602aa308225685…

MALICIOUS

PDF

48.2 KB Created: 2021-06-08 20:22:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: bd704ba87b5e7672a91d21815cc8aab5 SHA-1: 8f8098e9cf2cc54fc9312a49ec4244e7800daf7c SHA-256: 61602aa308225685ccfd46818f3dc012be64ab115e274ce5706ed4cd772c5c5a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links, specifically targeting users with lures related to game hacks and free generators. The primary malicious URL identified is https://netcdn.tw/app/431946152/how-to-hack-roblox-accounts-2021-zero-game-hack, which is linked to known malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect users to a malicious site, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/how-to-hack-roblox-accounts-2021-zero-game-hack In PDF document text
    • http://library.futureuniversity.com/repository/free-custom-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-spins-october-28-2021-coin-master_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-ios-hack_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/no-robux_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/roblox-redeem-codes-free_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/cheats-coin-master-free-spins-and-news_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-get-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-roblox-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/oprewards-login_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-printable-roblox-coloring-pages_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-free-spins-no-generator_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-robux-codes-2021_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_004_off00004e67.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E67 27860 bytes
SHA-256: c71a5d63c60dc2faeebe6ca7e58965522d8910e88aff52096756389f2a4bc1e6
font_01_sfnt_off00008d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D1D 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9708 19084 bytes
SHA-256: 952ee95fcee2f36b9ca6303fc22229a5c223c35248a535a02e2948b40a08eda1

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