Malicious PDF — malware analysis report

Static analysis result for SHA-256 51cf77a5078e54be…

MALICIOUS

PDF

46.9 KB Created: 2021-05-14 11:36:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c34a2092f877aff564f665c35f9bfdbb SHA-1: 5065fd9a465b3250b71a7a1d35ecd14ce25f98ca SHA-256: 51cf77a5078e54becdc5a1bd2eee1b1e7b805aa9634da9e0cbfb9aa8e4e3c9ad
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically advertising 'Coin Master' game hacks and free spins. The primary lure URL is https://netcdn.xyz/app/406889139/coin-master-free-spin-and-coin-link-haktuts-hacking-news-game-hack, which is flagged as malicious. The document body and embedded URLs reinforce this phishing and redirection theme, aiming to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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 https://netcdn.xyz/app/406889139/coin-master-free-spin-and-coin-link-haktuts-hacking-news-game-hack In PDF document text
    • http://www.controverseinterapie.it/images/irobux-com-redeem_GM431946152.pdfIn PDF document text
    • http://www.controverseinterapie.it/images/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://www.controverseinterapie.it/images/coin-master-instagram-free-spins_GM406889139.pdfIn PDF document text
    • http://www.controverseinterapie.it/images/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://www.controverseinterapie.it/images/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://www.controverseinterapie.it/images/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://www.controverseinterapie.it/images/mcpe-free-download_GM479516143.pdfIn PDF document text
    • http://www.controverseinterapie.it/images/moonactive-coin-master_GM406889139.pdfIn PDF document text
    • http://www.controverseinterapie.it/images/100-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.controverseinterapie.it/images/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.controverseinterapie.it/images/toolbox-for-minecraft-pe-ios_GM479516143.pdfIn PDF document text
    • http://www.controverseinterapie.it/images/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://www.controverseinterapie.it/images/optifine-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://www.controverseinterapie.it/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://www.controverseinterapie.it/images/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://www.controverseinterapie.it/images/coin-master-free-spins-whatsapp-link_GM406889139.pdfIn PDF document text
    • http://www.controverseinterapie.it/images/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://www.controverseinterapie.it/images/coin-master-hack-1021_GM406889139.pdfIn PDF document text
    • http://www.controverseinterapie.it/images/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • http://www.controverseinterapie.it/images/free-limiteds-roblox_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_off00004f05.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F05 25140 bytes
SHA-256: 6fcb4f5fe752579ea22c0969db9f9cce8254be3ed60027680528aed192db3e86
font_01_sfnt_off00008813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8813 3204 bytes
SHA-256: 8c2546387700f45186c395d475006178ee984eabbc175bcf1ee6eb58ba8b57aa
font_02_sfnt_off00009316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9316 18824 bytes
SHA-256: ef8f09fc3c17cc4f26b4837a2aef37de344b1ca430b1a31f5cb27c991d5625de