Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0055e72ed3531b…

MALICIOUS

PDF

43.7 KB Created: 2021-05-16 22:56:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a434df08341ff0570e39ef2a84b8ac0b SHA-1: 10c408f802d9e94d53e4d2a556829452bc86cf7c SHA-256: 4d0055e72ed3531b7e25037f46ac2d3a2952208aed5a455d3d095a26e90a84a2
220 Risk Score

Malware Insights

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

The PDF document employs a lure of "free generator / game hack" for "Coin Master" and presents a fake CAPTCHA to trick users into clicking malicious links. The embedded links lead to known malicious redirector infrastructure, suggesting an attempt to download further malicious content or redirect to phishing sites. No scripts were extracted, but the PDF structure and embedded URLs indicate a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

Heuristics 6

  • 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.
  • 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
  • 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/406889139/spinuri-gratis-coin-master-game-hack In PDF document text
    • http://www.pleiadisrl.it/images/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://www.pleiadisrl.it/images/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pleiadisrl.it/images/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://www.pleiadisrl.it/images/free-roblox-generator-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.pleiadisrl.it/images/free-robux-net_GM431946152.pdfIn PDF document text
    • http://www.pleiadisrl.it/images/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://www.pleiadisrl.it/images/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pleiadisrl.it/images/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://www.pleiadisrl.it/images/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
    • http://www.pleiadisrl.it/images/simplysarc_GM479516143.pdfIn PDF document text
    • http://www.pleiadisrl.it/images/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://www.pleiadisrl.it/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://www.pleiadisrl.it/images/coin-master-tricks_GM406889139.pdfIn PDF document text
    • http://www.pleiadisrl.it/images/free-unlimited-coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • http://www.pleiadisrl.it/images/roblox-sexually-abused_GM431946152.pdfIn PDF document text
    • http://www.pleiadisrl.it/images/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://www.pleiadisrl.it/images/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://www.pleiadisrl.it/images/roblox-ban_GM431946152.pdfIn PDF document text
    • http://www.pleiadisrl.it/images/coin-master-free-spins-today-new_GM406889139.pdfIn PDF document text
    • http://www.pleiadisrl.it/images/get-free-robux-now_GM431946152.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_003_off00004707.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4707 24796 bytes
SHA-256: 5144ddd5c471c93d4bf7555fc704ab76b3019074dbe5c5209e74024e5d5168f3
font_01_sfnt_off00007f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F49 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8934 17860 bytes
SHA-256: 372d64fe8ef96255a12fa644d41377f2b117b1e32b2da9ab2f07e049597555f8

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