Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b11ef2de9b2fd42…

MALICIOUS

PDF

42.6 KB Created: 2021-05-15 10:37:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 74669d132c43de752aead74c0616bf81 SHA-1: 4c5ed2eec526b0dfdf7fe42d4e9e578de2fca3ef SHA-256: 8b11ef2de9b2fd42f8cae32a88e29093449f24b5b3ad7d84f251c58c0582f8e4
182 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing and a seed-phrase/secret-recovery lure. The file routes users through malicious redirector infrastructure 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 6

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • 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.xyz/app/406889139/coin-master-link-daily-get-free-spins--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
  • 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-link-daily-get-free-spins--game-hack PDF link annotation
    • http://itc-nekretnine.hr/files/coin-master-spin-link-free-download_GM406889139.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/earn-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/coin-master-free-spins-glitch_GM406889139.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/flip-master-free-coins_GM406889139.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/free-100-robux_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/mcpe-hacks_GM479516143.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/roblox-earn-robux_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/coin-master-tiradas-gratis_GM406889139.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/pop-slots-free-vegas-casino-slots-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/minecraft-pe-hack-client_GM479516143.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_off00004aa1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AA1 25372 bytes
SHA-256: 93344c738fd5c51371762f77b7b1bb7356d4b2cf6e1740f0476f4119f6fc9338
font_01_sfnt_off0000838a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x838A 18476 bytes
SHA-256: c782d5e6373f7b618e30093e46bdd0ad9852ae556b34a7cf912e549ddbf001ac

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