Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fdbabafe3fdfdaa…

MALICIOUS

PDF

38.0 KB Created: 2021-05-21 17:11:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8f1e0085e503e8448de580f351fe1103 SHA-1: d81a560445c518b1a469c9edd57015930cd42c74 SHA-256: 9fdbabafe3fdfdaac2685b5c4e0bdd2feb7ebbc316cb9db6a1c057c9abfdf6fa
200 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically advertising 'free generator / game hack' lures. It impersonates the Walmart brand to trick users into clicking these links. The ML classifier also flagged this PDF as malicious, supporting the assessment of a credential phishing and redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9407

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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/rich-free-roblox-accounts-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
  • 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/rich-free-roblox-accounts-game-hack In PDF document text
    • http://alcomet.ru/images/hack-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://alcomet.ru/images/free-online-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • http://alcomet.ru/images/minecraft-xbox-360-free_GM479516143.pdfIn PDF document text
    • http://alcomet.ru/images/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://alcomet.ru/images/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31DE 29264 bytes
SHA-256: 5632b525e41daee018025d6e4580e2a5323ca0964a3123e3fbd78bc6c943cac8
font_01_sfnt_off000072fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72FB 18476 bytes
SHA-256: 69e1d5e5a83ed6ac699c80c427ab379f6df08c8c6cfae5eea415a35bb5866042

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