Malicious PDF — malware analysis report

Static analysis result for SHA-256 59ae45974ba2ec25…

MALICIOUS

PDF

44.8 KB Created: 2021-06-11 08:49:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 45a4ca9b5f74bd7ed37de3e4344330ab SHA-1: 7633dced7947b098ffc1ecd9476acad8b7cad6af SHA-256: 59ae45974ba2ec258adf6c83279d8e48af922717315e84383014c6328bb4c592
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and game-related lures, such as 'free Robux' and 'game hack'. The primary malicious URL identified is https://netcdn.tw/app/431946152/free-robux-grouos-game-hack, which is flagged as a malicious redirector. The document body, though partially corrupted, contains references to this URL and game-related terms, reinforcing the lure. No scripts were extracted, but the embedded links strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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-robux-grouos-game-hack In PDF document text
    • http://libnh.stikesnh.ac.id/repository/blogspot-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-hack-ios-download-2021_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-games_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/march-18-roblox-hack_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/win-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-minecraft-realms-to-join_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/pokemon-go-free-636_GM1094591345.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-coin-master-credit_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-roblox-clothes-catalog_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-spins-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/earn-free-robux-with-points_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-roblox-hair-to-wear_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-spins-coin-master-without-survey_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_off000052df.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52DF 25624 bytes
SHA-256: 876fe77dcb85d73077b41f9fe5bc2afecbaa4082042d2b786b8109ad2c8108c9
font_01_sfnt_off00008d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D69 18012 bytes
SHA-256: 5058a794ec72f136c381c75c7f3146f70e7a330fe933e0ecab1a56ea815c2fd5

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