Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50c6d0a3c17a8bb…

MALICIOUS

PDF

48.7 KB Created: 2021-06-04 00:35:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ea0a1d52df8508cdb04be4a787e7d28e SHA-1: c57e730a289d07a7b551e1090b0d1a5e6179ed27 SHA-256: d50c6d0a3c17a8bb237900068aa25e0860e06c8df7f8542e8fd4d49144752e09
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting a "free Robux generator" lure. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves tricking users into visiting these malicious URLs, likely to download further malware or engage in phishing. No scripts were extracted, but the embedded URLs are the main indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.online/app/431946152/free-robux-generator-no-human-verification-or-survey-2021-game-hack In PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/gain-robux_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/coinmasterdailyfreespins-com_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/info-roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/free-roblox-groups-with-funds_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/how-to-get-free-roebucks-without-verification_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/coin-master-hack-that-actually-works_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/roblox-big-paintball-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/free-spin-coin-master-instagram_GM406889139.pdfIn PDF document text
    • http://e-lib.smaxaverius5.sch.id/repository/coin-master-free-spins_GM406889139.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_off000050ce.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50CE 26568 bytes
SHA-256: f266fe0bb6f4b4a39f497cd275ae9cadfa565bcfbc484815d85665ef61879213
font_01_sfnt_off00008de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DE9 2844 bytes
SHA-256: d4efd49219a7ff6424c923a6ccef5b7e1750ded18bbd79546f2ad196ddc76c43
font_02_sfnt_off000097a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97A9 19556 bytes
SHA-256: 3a60cdb248c638d1e974f8488a9d0c49865e0dbecbd8cc682acbe36144e2e86e

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