Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6d7f793065b824…

MALICIOUS

PDF

45.0 KB Created: 2021-06-07 04:14:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ef750b72eb772ec6623bc01350d9420d SHA-1: da4e6baf4fadc239db8b27ee85e2d4dd1907c3b9 SHA-256: aa6d7f793065b82437edd189ae3c363320aa67e11fd00d0b81f4aedeac88ad35
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing and a callback-phone (TOAD) 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 0.9865

Heuristics 6

  • 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.tw/app/431946152/como-tener-robux-hack-2021-game-hack.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.tw/app/431946152/como-tener-robux-hack-2021-game-hack PDF link annotation
    • https://katalog.smkn1glagah.sch.id/repository/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/free-executors-for-roblox_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/how-to-gift-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/coin-master-free-spins-link-2021-iphone_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/minecraft-bedrock-hacks-windows-10_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-coins-2021-coin-master-link_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-minecraft-domain_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-spins-coin-master-march-2021_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/roblox-hack-me-robux_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_004_off0000508c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x508C 25752 bytes
SHA-256: d24abb140aba2d187958731fad948a07627dcd42a9c15c02787d23278e015122
font_01_sfnt_off00008b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B5B 18912 bytes
SHA-256: 92656de73b1dd4e1aa46c4cc2f20f492ce545c82cd3b7fc80044ab9dcdfbbb8e

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