Malicious PDF — malware analysis report

Static analysis result for SHA-256 857d62499330a5ab…

MALICIOUS

PDF

49.8 KB Created: 2021-06-08 23:45:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a7caa6f5d56952b736e768aee92c4078 SHA-1: dc7e8d7c0e7816d19a19a8637022048d296c48a9 SHA-256: 857d62499330a5ab45364190a0c249451236a039f94dc8b8f0969132b6c231d2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free stuff on Roblox' or 'game hacks'. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the lure of free items suggest a phishing or scam attempt, likely leading to further malware download or credential harvesting.

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/free-stuff-on-roblox-catalog-2021-game-hack In PDF document text
    • http://digilib.uim.ac.id/repository/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-com_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/best-shirt-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-legit_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-script-executor-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-exploit-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-hacked-apk-download-for-android_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-spins-on-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/robux-for-kids_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052df.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52DF 28136 bytes
SHA-256: 038acb2bc2fd4a98638dc915d433804095eb2d6057acc1f3c2eabbc59437a356
font_01_sfnt_off0000932a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x932A 2912 bytes
SHA-256: 02b35010e2614e3cc95ac6414c49295350c91fdfcc4b4cad27ffdbc10e80df7f
font_02_sfnt_off00009d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D27 19112 bytes
SHA-256: eb74f21d1a3452680e700a69a2a511b15c3dc2c2dce6923b978a946f9d195710

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