Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b8a3efcd5c3615…

MALICIOUS

PDF

48.1 KB Created: 2021-06-07 17:32:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a91849b838a0eb810b9df9bdd1869bfd SHA-1: bd2a437035d3dad6ae2c2db1d6affde4bd45d5a8 SHA-256: 85b8a3efcd5c361513b6eb2a3fb05fc522d28351ac5880db53362487d654e6b5
200 Risk Score

Malware Insights

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

This PDF document contains multiple links that redirect to malicious infrastructure, masquerading as game hacks and cheats. The document impersonates Microsoft to lend credibility to the lures, aiming to trick users into clicking through to potentially harmful sites. The embedded links are designed to exploit user interest in free in-game currency or cheats, leading to a credential phishing or malware download scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.
  • 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.tw/app/431946152/cheat-engine-roblox-hacks-2-18-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.tw/app/431946152/cheat-engine-roblox-hacks-2-18-game-hack In PDF document text
    • http://bgnails.nl/images/free-roebucks-com_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/give-me-robux-now_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • http://bgnails.nl/images/como-hackear-coin-master-en-espaol_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/pubg-mobile-uc-2021_GM1330123889.pdfIn PDF document text
    • http://bgnails.nl/images/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/free-minecraft-skins-java_GM479516143.pdfIn PDF document text
    • http://bgnails.nl/images/free-minecraft-severs_GM479516143.pdfIn PDF document text
    • http://bgnails.nl/images/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/robux-com-free_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/minecraft-wurst-client_GM479516143.pdfIn PDF document text
    • http://bgnails.nl/images/coin-master-free-spins-bit-ly_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • http://bgnails.nl/images/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/roblox-com-www_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_004_off000050d4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50D4 25680 bytes
SHA-256: 9886dc74703c61be3a97bf0264f19163ac3da1d86731eebfe80a5db0a70916ec
font_01_sfnt_off00008c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C42 2828 bytes
SHA-256: db1860fd79a3f2cbe32e2bada3ba4c68a2d581b7a24294387cd777233cc9cef6
font_02_sfnt_off000095f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95F9 19336 bytes
SHA-256: 8a085c7119300545469597ea85a49dff520e9e1ad0aee95fa5ed22e8f2da5a07

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