Malicious PDF — malware analysis report

Static analysis result for SHA-256 42fa380ddfe8f45d…

MALICIOUS

PDF

40.5 KB Created: 2021-05-18 02:06:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 3b695e9bcceef76e066a8a559adb3c57 SHA-1: bad03dfcfccd3bdc0a97dc845e5d023123554392 SHA-256: 42fa380ddfe8f45d3eccc9ae595896574a8dd68245dbfc3537aa6b1e4b6f2271
202 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure and a fake-CAPTCHA lure. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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
  • 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/free-robux-game-hack PDF link annotation
    • http://greasley.website/images/coin-master-free-spinv1-0apkpure-com-apk_GM406889139.pdfIn PDF document text
    • http://greasley.website/images/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://greasley.website/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://greasley.website/images/coin-master-card-link-free_GM406889139.pdfIn PDF document text
    • http://greasley.website/images/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://greasley.website/images/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://greasley.website/images/can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://greasley.website/images/spin-and-coin_GM406889139.pdfIn PDF document text
    • http://greasley.website/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://greasley.website/images/minecraft-apk-114_GM479516143.pdfIn PDF document text
    • http://greasley.website/images/coin-master-hack-spin-generator-tool_GM406889139.pdfIn PDF document text
    • http://greasley.website/images/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://greasley.website/images/is-minecraft-free_GM479516143.pdfIn PDF document text
    • http://greasley.website/images/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://greasley.website/images/coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • http://greasley.website/images/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • http://greasley.website/images/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://greasley.website/images/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://greasley.website/images/coin-master-hack-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://greasley.website/images/earn-robux-com_GM431946152.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_003_off0000437e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x437E 24800 bytes
SHA-256: e0680b33e37aa687d33ac3af3e77d771eca7538caf7273b2cbe60ce5e78d383a
font_01_sfnt_off00007c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C9A 18012 bytes
SHA-256: 3ef9e48aa3d97d4217e004f7625a8cbae9320a74231b80a01553f6433e422360

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