Malicious PDF — malware analysis report

Static analysis result for SHA-256 0187959e887c6497…

MALICIOUS

PDF

42.0 KB Created: 2021-05-15 07:57:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 663d8862365cb293610a0dd150029288 SHA-1: 97cd9a05ea63c9d8dcc541369bb1753d5320f85c SHA-256: 0187959e887c6497d91634f1330567855473b2c9da08a13e1a92c507103a29be
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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
  • 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/406889139/coin-master-3.5-13-hack-download-game-hack PDF link annotation
    • http://razredna-nastava.net/files/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-online-hack-no-survey-no-password_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/hack-game-plus-com-coin-master_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-coin-master-spin-generator_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-spins-on-coin-masters_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-hack-app-link_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/get-free-spins-on-coin-master-links_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/robux-apk_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-roblox-printables_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/haktuts-coin-master-free-spins_GM406889139.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
stream_003_off000046f3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46F3 24856 bytes
SHA-256: 07304b74cd78629bd2dc36ad3e4003d6033f946522cb864cdb218c95b6b5bc12
font_01_sfnt_off0000804d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x804D 18776 bytes
SHA-256: 580191f9d67cac0e57befe9d9f36e9aa4ec96fc89a456a262982ca34f80561e7

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