Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33bfeb9f18aa7f2…

MALICIOUS

PDF

44.1 KB Created: 2021-06-09 09:08:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 00c375935dc0ac827a62954d75a8fa19 SHA-1: 6e7966f37f210f492b2dded41555f1a6a4d0acce SHA-256: e33bfeb9f18aa7f2aae86fa36b9e28826659fd4683daafb06b16d19762df25e1
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) 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 0.9865

Heuristics 6

  • 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.
  • 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.tw/app/431946152/games-that-give-u-free-robux-game-hack PDF link annotation
    • http://kermas.eu/images/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/roblox-free-clothes-codes_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/minecraft-free_GM479516143.pdfIn PDF document text
    • http://kermas.eu/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/how-to-hack-coin-master-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/hack-robux_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/coin-master-free-coins-twitter_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • http://kermas.eu/images/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/all-coin-master-spin-link-and-free-download_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/game-hunters-coin-master_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
stream_004_off00004dfc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DFC 24840 bytes
SHA-256: bffc9f4cd714be4550d27828020c95d7789acb737ccd42100464f34bdb5310cd
font_01_sfnt_off0000874b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x874B 19192 bytes
SHA-256: 928a99f4330ec13905bc8388ae53fa2364c3ed1aa8f70fee92e85ee6df75c2c7

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