Malicious PDF — malware analysis report

Static analysis result for SHA-256 acfde5ca8b039c10…

MALICIOUS

PDF

43.9 KB Created: 2021-05-11 22:31:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 10672e947452bb78eab99dc7c8e57a8f SHA-1: aab6f008c30b5fce09f13e33cf932ad08f201c0d SHA-256: acfde5ca8b039c104ba779cfe26904b31b5b39f4f0c35806917a77a492c6f35f
282 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document employs a fake CAPTCHA and social engineering tactics, instructing users to click links or run commands, which is a common ClickFix attack pattern. The embedded links, such as 'https://netcdn.xyz/app/479516143/free-minecraft-maps-game-hack', likely lead to the download of a second-stage malicious payload. The document also contains a large number of external PDF links, suggesting it may be part of a link farm designed to improve SEO for malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 8

  • 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.
  • Fake CAPTCHA with command-running instructions critical SE_FAKE_CAPTCHA_CLICKFIX
    Document combines fake CAPTCHA or human-verification language with instructions to paste or run a command — a high-confidence ClickFix 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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
  • 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/479516143/free-minecraft-maps-game-hack PDF link annotation
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/coin-master-hack-android-no-root_GM406889139.pdfIn PDF document text
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/how-to-make-a-minecraft-bedrock-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/free-minecraft-realm-codes_GM479516143.pdfIn PDF document text
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/hack-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/coin-master-collect-today-free-spin_GM406889139.pdfIn PDF document text
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/minecraft-toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/coin-master-free-coins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/free-spins-coin-master-cheat_GM406889139.pdfIn PDF document text
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/do-robux-generators-work_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5160 25472 bytes
SHA-256: 3db3cb5552732ca3605f43d99f3d70a16820a8e4afed0ba259da42aa3cda3033
font_01_sfnt_off00008b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B0B 17744 bytes
SHA-256: 642e76b92f67015eb87e7bb2f8978493590a3d76ebc6958dd5b149369a6bd5f2

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