Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16b314eced4bd20…

MALICIOUS

PDF

50.1 KB Created: 2021-06-08 11:54:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3bfe68701d670949d3601401407ed1a2 SHA-1: 80eb98711d4747850e2f317d51f4f67a57b6f0d1 SHA-256: d16b314eced4bd201a696ed35eb910a0db32926c180f9df3eb47852e9566cf0c
162 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 fake-CAPTCHA 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 0.9734

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-necklace-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 https://netcdn.tw/app/431946152/free-necklace-roblox-game-hack PDF link annotation
    • https://www.ma-plast.hr/files/robux-hack-me_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/lazyblocks-com-robux_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • https://www.ma-plast.hr/files/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/roblox-free-executor_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/free-coin-master-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://www.ma-plast.hr/files/minecraft-java-free-download_GM479516143.pdfIn PDF document text
    • http://www.ma-plast.hr/files/coin-master-facebook-page_GM406889139.pdfIn PDF document text
    • https://www.ma-plast.hr/files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/minecraft-free-download_GM479516143.pdfIn PDF document text
    • http://www.ma-plast.hr/files/roblox-script-executor-free_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/free-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • http://www.ma-plast.hr/files/minecraft-free-version-pc_GM479516143.pdfIn PDF document text
    • http://www.ma-plast.hr/files/free-roblox-outfits-2021_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/free-minecraft-severs_GM479516143.pdfIn PDF document text
    • https://www.ma-plast.hr/files/facebook-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ma-plast.hr/files/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004db3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DB3 24940 bytes
SHA-256: 2e948907b98df75fb3cfb8f71a5fdc49384a77df3186d03f4f2e524ee7123ef6
font_01_sfnt_off00008751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8751 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off000093f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93F3 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_03_sfnt_off0000a09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA09B 18344 bytes
SHA-256: 585a40d75fbeba8ffc698e9255b9088b6062e2599afbccc55e1d3eaf9f97d108

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