Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dbd791dbb42f7f2…

MALICIOUS

PDF

44.8 KB Created: 2021-05-12 14:30:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 0ef69645582716271b14a3b06d44d8a1 SHA-1: 33225796f670cc4cbf1099e6b85024c7b9205b23 SHA-256: 8dbd791dbb42f7f2122d31bbda5b5cff7d6f39f26f75d2224e2f1037f71cb78d
92 Risk Score

Malware Insights

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

The PDF contains a high-severity heuristic firing for a 'free generator / game hack' lure that impersonates Facebook. The embedded URL, https://netcdn.xyz/app/431946152/how-to-get-free-robux-2021-easy-game-hack, is the primary indicator of compromise. While no scripts were extracted, the nature of the lure suggests a phishing or credential harvesting attempt, or a redirect to a malicious payload delivery site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0115

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/how-to-get-free-robux-2021-easy-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/how-to-get-free-robux-2021-easy-game-hack PDF link annotation
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000036a2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x36A2 26360 bytes
SHA-256: 417fb1bd22968b9f1cf9bd7bd7583a73daa48ca13e20feacc1933fbf87bff9c1
font_01_sfnt_off00007430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7430 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00007ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DDD 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off00008aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AEE 19092 bytes
SHA-256: cc4041fc50bd2ea9a1268967e32916156e3a634973a216864dd7f220ceb04504

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