Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9cf057526c84d2…

MALICIOUS

PDF

35.2 KB Created: 2021-07-09 01:39:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 214b4655a995bc8d23194351073c5050 SHA-1: bf03430d3e28e4b9e32b09b9d64508dd21b99d51 SHA-256: 3e9cf057526c84d27c5e6219f847ff506fbe8fe9c3f5a3a70cdc0d36a8cf87ef
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including a known malicious redirector at http://netcdn.tw/app/431946152/free-robux-safe-game-hack. The document body and heuristics indicate a lure for free in-game currency or hacks, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/free-robux-safe-game-hack In PDF document text
    • http://www.elearning.mysadam.info/__statics/gudangsoal/files/is-roblox-free-on-ps4_GM431946152.pdfIn PDF document text
    • http://elearning.mysadam.info/__statics/gudangsoal/files/how-do-i-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.elearning.mysadam.info/__statics/gudangsoal/files/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.elearning.mysadam.info/__statics/gudangsoal/files/profile-roblox-free_GM431946152.pdfIn PDF document text
    • http://elearning.mysadam.info/__statics/gudangsoal/files/coin-master-hack-xyz-download_GM406889139.pdfIn PDF document text
    • http://www.elearning.mysadam.info/__statics/gudangsoal/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elearning.mysadam.info/__statics/gudangsoal/files/earn-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elearning.mysadam.info/__statics/gudangsoal/files/roblox-hack-fr-pc_GM431946152.pdfIn PDF document text
    • http://www.elearning.mysadam.info/__statics/gudangsoal/files/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.elearning.mysadam.info/__statics/gudangsoal/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://elearning.mysadam.info/__statics/gudangsoal/files/how-to-run-lua-script-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://elearning.mysadam.info/__statics/gudangsoal/files/free-game-pack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elearning.mysadam.info/__statics/gudangsoal/files/how-to-get-20210-robux-free-on-phone_GM431946152.pdfIn PDF document text
    • http://www.elearning.mysadam.info/__statics/gudangsoal/files/coin-master-free-spins-2021-haktuts_GM406889139.pdfIn PDF document text
    • http://www.elearning.mysadam.info/__statics/gudangsoal/files/roblox-how-to-give-self-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning.mysadam.info/__statics/gudangsoal/files/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://www.elearning.mysadam.info/__statics/gudangsoal/files/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://elearning.mysadam.info/__statics/gudangsoal/files/coin-master-free-spins-today-39_GM406889139.pdfIn PDF document text
    • http://www.elearning.mysadam.info/__statics/gudangsoal/files/coin-master-hack-that-actually-works_GM406889139.pdfIn PDF document text
    • http://elearning.mysadam.info/__statics/gudangsoal/files/free-coin-master-spins-and-coins_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
font_00_sfnt_off000032df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32DF 22580 bytes
SHA-256: 8347e9ced2b9ab2b36f7b1fae7fa72e869f0a1826c8938b7b0f7bd8b5aa00656
font_01_sfnt_off00006582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6582 18716 bytes
SHA-256: 10dbf18a398b54dbdf12e35bff00225a1ca49c244028279e5f56b846bcc4a5be

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