Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3d51bc50aee384…

MALICIOUS

PDF

35.3 KB Created: 2021-06-19 08:33:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 31ec057fe5451479d60979eaa13349f5 SHA-1: 268192d4cd3afc294965f76ee122da4c3a10b76b SHA-256: 3a3d51bc50aee3843366d95ad96ae1465c4520f7376113f3ab35d352bd884f2f
122 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. 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 0.9980

Heuristics 5

  • 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: http://netcdn.co/app/431946152/free-rolls-hack-elemental-wars-roblox-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 http://netcdn.co/app/431946152/free-rolls-hack-elemental-wars-roblox-game-hack PDF link annotation
    • http://schrichte.de/images/free-robux-codes-2021-october_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/free-roblox-injecter-v3rmillipn_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://schrichte.de/images/cute-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/free-roblox-dominus_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/free-robux-using-a-website_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/facebook-coin-master_GM406889139.pdfIn PDF document text
    • http://schrichte.de/images/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://schrichte.de/images/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://schrichte.de/images/free-roblox-us_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/robux_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/master-game_GM406889139.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
font_00_sfnt_off0000303f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x303F 23032 bytes
SHA-256: b9ae2091a39f2d0d40ceb1bb5c84dc420c47fa9b566e6d1a9b1c2e86fb790191
font_01_sfnt_off000063e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E9 19384 bytes
SHA-256: 25f00c44903df36b0fb7ec10042ed811bec172b645af389acb8f45e901755a04

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