Malicious PDF — malware analysis report

Static analysis result for SHA-256 a376ec7d6096686b…

MALICIOUS

PDF

47.8 KB Created: 2021-06-03 15:24:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f39ffd65dc44fac95e58fb8e6a99621d SHA-1: 3f0cb985327f54995b5a10a692de72eecdffd280 SHA-256: a376ec7d6096686b1969de3bd31074273378bb1e1175b04fb244c88ade66c961
260 Risk Score

Malware Insights

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

This PDF document is designed to trick users into clicking a link that promises free game currency or hacks, which redirects to malicious infrastructure. The document also contains a fake CAPTCHA prompt, further reinforcing the deceptive nature of the lure. The presence of numerous links to other PDFs suggests a link farm intended to improve SEO for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.
  • 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 / 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
  • 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.online/app/406889139/hack-coin-master-game-game-hack In PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-free-spins-app-for-iphone_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-tiktok-followers-without-verification_GM835599320.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/mcpe-com_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-minecraft-for-free-on-tablet_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-free-spin-no-offers_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/gameoffice-net-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/minecraft-free-school_GM479516143.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000540a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x540A 26000 bytes
SHA-256: 4105d81e6a8bca48a73e5cad1bd7c8c184fba53e2c411617baeb5a88215d50a7
font_01_sfnt_off00008f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F3B 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9926 17976 bytes
SHA-256: 849fda9a27f10f21eac2a108988feb595c64d385794befb8f0e2a1653e8ad0ee

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