Malicious PDF — malware analysis report

Static analysis result for SHA-256 044e1446b12b2aec…

MALICIOUS

PDF

44.5 KB Created: 2021-05-16 22:42:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4f8ccaa90a9225af9ea20a52abce50f0 SHA-1: 1bc6ea0d9a2d5169ce668321fb5c5059290fc0fd SHA-256: 044e1446b12b2aecbe6f6fa15310e84ea2d6110d2f26f658651d657945c1bf1c
240 Risk Score

Malware Insights

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

This PDF document employs a lure of game hacks and a fake CAPTCHA to trick users into clicking malicious links. The primary link, https://netcdn.xyz/app/406889139/coin-master-games-hack-game-hack, is identified as a malicious redirector. The document's structure and embedded URLs suggest an attempt to deliver a second-stage payload or phish for credentials, aligning with common tactics for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/406889139/coin-master-games-hack-game-hack.
  • 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-games-hack-game-hack In PDF document text
    • https://www.flexcable.com/images/coin-master-golden-card-hack_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/coin-master-free-spins-link-2021-app_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/coin-master-free-spins-8-14-2021_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/coin-master-games-download-free_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/free-minecraft-skins-java_GM479516143.pdfIn PDF document text
    • https://www.flexcable.com/images/hacks-para-coin-master_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/coin-master-spin-rewards_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/coin-master-free-spins-moonactive_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/free-roblox-toys_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • https://www.flexcable.com/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/free-robux-glitch_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_off000049b7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49B7 25452 bytes
SHA-256: 626cd12838907aa7c6b67094a39e705cdad3632c880871e1f4c3a7addee07547
font_01_sfnt_off00008277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8277 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C62 17976 bytes
SHA-256: 4c1d26c1fb4feed8092d99a8761960172faa49b0c213e7324f16c91828cd6f14

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