Malicious PDF — malware analysis report

Static analysis result for SHA-256 04d627d00674d2ec…

MALICIOUS

PDF

51.4 KB Created: 2021-06-07 08:34:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b623c6933c66f0b48981a739c50e0a41 SHA-1: 6cede910e4f75f73086c04125d610c77f9712986 SHA-256: 04d627d00674d2ec2bba596a8823daa143f89ac80af97fcfaab85557e3a3091d
182 Risk Score

Malware Insights

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

This PDF document employs a game hack lure to trick users into clicking malicious links, impersonating brands like Facebook. It redirects to a link farm containing numerous other PDF files, suggesting a coordinated effort to distribute malware or phish for credentials. The ML classifier strongly indicated maliciousness, and the PDF structure points to a link farm designed for SEO manipulation and traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9327

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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-money-in-mad-city-in-roblox-with-codes-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-money-in-mad-city-in-roblox-with-codes-game-hack PDF link annotation
    • http://szekelymozes.ro/images/minecraft-images-free_GM479516143.pdfIn PDF document text
    • http://szekelymozes.ro/images/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/coin-master-free-spins-link-no-verification_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/coin-master-hack-account_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/minecraft-hacker-skin_GM479516143.pdfIn PDF document text
    • http://szekelymozes.ro/images/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/coin-master-spin-link-free-download_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/free-spin-app-coin-master_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/how-to-make-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://szekelymozes.ro/images/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/coin-master-hack-tool-v1-9-apk_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/free-spins-coin-master-links-app_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/coin-master-free-spin-today-2021_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/wwwcoin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/twitter-coin-master-free-spins_GM406889139.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_off000052ba.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52BA 29320 bytes
SHA-256: 2be2b48f3b6a9f93c3583e3afaa6b3e8cc948722d1d056c3bb3d648fa99fc95c
font_01_sfnt_off0000966d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x966D 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000a37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA37E 19312 bytes
SHA-256: d3bddf4c108a6d379d0ef6ac07f5f2d2ae199af4e8257c3a3c691e331a691731

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