Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e3f5c2441f40cf…

MALICIOUS

PDF

42.5 KB Created: 2021-05-16 15:19:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 666c03ca152ba604c517d29feed4ed82 SHA-1: 2373234d9713246c3de4f0d7bbb11b5eb281e227 SHA-256: 86e3f5c2441f40cfa40b3b42bfb94b7ffde6b41f8661cbc2aeba290141c54e10
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 0.0223

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/roblox-pics-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/roblox-pics-game-hack PDF link annotation
    • https://www.interfaceventos.com.br/imagens/files/how-to-get-free-hair-on-roblox_GM431946152.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_003_off000032bc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32BC 29436 bytes
SHA-256: a51c4f9abea27ff64c94ac3b47cac4e2d0e93c92ad26906040216a72370c1c10
font_01_sfnt_off00007527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7527 6768 bytes
SHA-256: fa93de321190668b294ff46149e4b98ac349b4fd022dcee9ecd964f7f59f3f9a
font_02_sfnt_off00008565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8565 18060 bytes
SHA-256: 4ad043eb0dd1568e4a2653429ea485ab96dada409891d91a29e15aee7c370b08

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