Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff5e8435a95cefd…

MALICIOUS

PDF

42.5 KB Created: 2021-05-19 06:18:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4d6133c7158e11677b00014a4fdbf67b SHA-1: 97ecc721f44f9398c2a3db97311ef281534b6831 SHA-256: fff5e8435a95cefdafbaa0d5de878fb99353cca483851ef560aa08f12b366e49
200 Risk Score

Malware Insights

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

The PDF document contains a malicious redirector link disguised as a 'free generator / game hack' for Coin Master, and presents a fake CAPTCHA to trick users into interacting with it. The ML classifier strongly flagged this PDF as malicious. The embedded links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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
  • 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-fan-page-free-spins-game-hack In PDF document text
    • http://1a-vermietung.com/images/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • http://1a-vermietung.com/images/is-tiktok-free-on-voxi_GM835599320.pdfIn PDF document text
    • http://1a-vermietung.com/images/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://1a-vermietung.com/images/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://1a-vermietung.com/images/minecraft-114-download_GM479516143.pdfIn PDF document text
    • http://1a-vermietung.com/images/roblox-avatar-com_GM431946152.pdfIn PDF document text
    • http://1a-vermietung.com/images/roblox-how-to-get-free-clothes_GM431946152.pdfIn PDF document text
    • http://1a-vermietung.com/images/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://1a-vermietung.com/images/coin-master-hack_GM406889139.pdfIn PDF document text
    • http://1a-vermietung.com/images/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • http://1a-vermietung.com/images/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://1a-vermietung.com/images/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
    • http://1a-vermietung.com/images/coin-master-free-spin-link-list_GM406889139.pdfIn PDF document text
    • http://1a-vermietung.com/images/how-to-get-free-pets-in-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • http://1a-vermietung.com/images/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://1a-vermietung.com/images/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://1a-vermietung.com/images/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://1a-vermietung.com/images/how-to-get-free-hair-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://1a-vermietung.com/images/pokemon-go-free-account-username-and-password_GM1094591345.pdfIn PDF document text
    • http://1a-vermietung.com/images/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a9f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A9F 24836 bytes
SHA-256: 81ca8ae259c986857cd7a96cb758bb034873222b2eadadf06fcae18bf16a2cf1
font_01_sfnt_off000083ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83AD 18328 bytes
SHA-256: d106028e9c816c4ed38d7f9dbfb4c1b42a2571be69ef627f7b4a635c4c6a8b94