Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cc0cc39a80ed2b1…

MALICIOUS

PDF

40.4 KB Created: 2021-05-23 17:38:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2b15403a80a0472da453880b2ab63dbe SHA-1: 5399a101a6abbfea0068a5281c3477be76fc5474 SHA-256: 9cc0cc39a80ed2b10b5cfee758a283b1aecbdae56c7531bcc4a8f594794a72ab
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link T1204.002 Malicious Link

The PDF document contains multiple links, including one that impersonates Facebook and promises free Robux, a common lure for credential phishing. The primary malicious URL, https://netcdn.xyz/app/431946152/free-robux-codes-game-hack, is associated with a game hack redirector and brand impersonation. The document body text and heuristics confirm the intent to trick users into clicking these links, likely to steal credentials or deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7776

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.xyz/app/431946152/free-robux-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.xyz/app/431946152/free-robux-codes-game-hack PDF link annotation
    • https://adirp.id/upload_data/files/free-downloads-for-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • https://adirp.id/upload_data/files/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://adirp.id/upload_data/files/lazyblocks-com-robux_GM431946152.pdfIn PDF document text
    • https://adirp.id/upload_data/files/how-to-get-free-food-for-foxy-in-coin-master_GM406889139.pdfIn PDF document text
    • https://adirp.id/upload_data/files/is-minecraft-realms-free_GM479516143.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_002_off00003425.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3425 27652 bytes
SHA-256: c671d441ff9b5bc778ba1d297fa569e94e12e0e94967b0760dc840de2edf7106
font_01_sfnt_off00007337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7337 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00007ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE5 18188 bytes
SHA-256: 7763b0eba74f003993d6ddc379ef756dfeeff7cedd1b34d70c41f8674d393ab3

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