Malicious PDF — malware analysis report

Static analysis result for SHA-256 0afdeffc54f5b486…

MALICIOUS

PDF

49.6 KB Created: 2021-06-08 22:44:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dcff57931691fc0b84f0a5dd72955a1d SHA-1: dcb2f23f78c5fa603c0e3af556fb08b32726e69b SHA-256: 0afdeffc54f5b4869040c2ecef5b5041c3d92f721d8ee4d0e6cea09819e18387
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 0.9796

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: https://netcdn.tw/app/431946152/free-robux-generator-2021-no-human-verification-rearl-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.tw/app/431946152/free-robux-generator-2021-no-human-verification-rearl-game-hack PDF link annotation
    • https://allpromise.com.tw/image/data/files/hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/coin-master-free-stuff-links_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/minecraft-education-free_GM479516143.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/free-coins-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/minecraft-112-2-hacked-client_GM479516143.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/how-to-get-the-zombie-animashon-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/how-to-get-tiktok-famous-free_GM835599320.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/roblox-skins-boy-free_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/best-free-minecraft-server-hosting-reddit_GM479516143.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/free-robux-without-human-verification-2021_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_off000055e3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x55E3 25896 bytes
SHA-256: 7da038b39673e97df78bdc1c8c4027572d98fee4b2de76ce684f8ae75e231984
font_01_sfnt_off000091d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91D1 2976 bytes
SHA-256: b7daa4357130991615914848b8ce5643769015a04fdd9df8d32cdb0725619d84
font_02_sfnt_off00009c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C0C 19336 bytes
SHA-256: 9ff35a53bcf30bf95a0f3cc7f561b2974a5746dd93779b5e496a2f1ce3b16467

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