Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50d580abd40b93e…

MALICIOUS

PDF

50.7 KB Created: 2021-05-17 17:05:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 35b4881d8c2d9b7a38de67230fc2a626 SHA-1: 65635fe2511271ff2e088aff603b4b6817a25150 SHA-256: a50d580abd40b93ea1b29cf86201e15a19a574b3438fb0970ef6b47b419accda
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-severity heuristic indicating it links to a 'free generator / game hack' lure. The primary URL, https://netcdn.xyz/app/431946152/robux-free-gift-card-game-hack, is embedded within the document body and also appears in the extracted URLs. This suggests the document is designed to trick users into visiting a potentially malicious site, likely for credential harvesting or to download further malware. No scripts were extracted, but the PDF structure and embedded URLs are strong indicators of a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8594

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/431946152/robux-free-gift-card-game-hack PDF link annotation
    • https://rietenwinkel.nl/images/coin-master-hack-apk-latest-version-2021_GM406889139.pdfIn PDF document text
    • https://rietenwinkel.nl/images/coin-master-hack-spins-game-download_GM406889139.pdfIn PDF document text
    • https://rietenwinkel.nl/images/coin-master-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • https://rietenwinkel.nl/images/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://rietenwinkel.nl/images/coin-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://rietenwinkel.nl/images/clean-master-coins-hack_GM406889139.pdfIn PDF document text
    • https://rietenwinkel.nl/images/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://rietenwinkel.nl/images/coin-master-offline-hack_GM406889139.pdfIn PDF document text
    • https://rietenwinkel.nl/images/minecraft-for-free-apk_GM479516143.pdfIn PDF document text
    • https://rietenwinkel.nl/images/hack-coin-master-apk-ios_GM406889139.pdfIn PDF document text
    • https://rietenwinkel.nl/images/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • https://rietenwinkel.nl/images/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://rietenwinkel.nl/images/free-roblox-clothes_GM431946152.pdfIn PDF document text
    • https://rietenwinkel.nl/images/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • https://rietenwinkel.nl/images/actual-free-robux_GM431946152.pdfIn PDF document text
    • https://rietenwinkel.nl/images/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • https://rietenwinkel.nl/images/free-robux-accounts_GM431946152.pdfIn PDF document text
    • https://rietenwinkel.nl/images/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://rietenwinkel.nl/images/free-t-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://rietenwinkel.nl/images/roblox-generator_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000048dc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48DC 28176 bytes
SHA-256: 5c92f9646da6bb3cddb3facc1212236071648e3ee9fdc6e37cade75bc7db584e
font_01_sfnt_off000088d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88D5 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00009577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9577 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000a288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA288 18640 bytes
SHA-256: 299b54e9041e0eacb2b5f4a1a09a85f1fb6c0d753f38c204f1d1c9ff56031a85

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