Malicious PDF — malware analysis report

Static analysis result for SHA-256 677b820b8da49eaa…

MALICIOUS

PDF

38.2 KB Created: 2021-04-30 05:08:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 97dd6a814fd05c75426ff8491ea745de SHA-1: 8284562a2e25804140a6906cbe96efae2eefc12b SHA-256: 677b820b8da49eaa5bff4ba617a8fcbdc75606db141e66af6f21d1ad12d32bb3
92 Risk Score

Malware Insights

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

This PDF document was flagged as malicious. It uses brand-impersonation credential phishing. 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 clean score 0.0491

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/fps-roblox-hacks-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/fps-roblox-hacks-game-hack PDF link annotation
    • https://fridaytravelnepal.com/userfiles/files/redeem-code-roblox-free-robux-2021.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
stream_003_off0000373b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x373B 26624 bytes
SHA-256: 8ba515e5c3f8793e69ade9a10a3a6aaa955cd14f675a58138260f874a08f413b
font_01_sfnt_off00007377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7377 18524 bytes
SHA-256: 5b9c2716c8f81cfa5249e84cb18e8b41a387cd50eb16fcc6f3cfdf09c9e15abc

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