Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a42c71144a8be9…

MALICIOUS

PDF

36.2 KB Created: 2021-05-21 12:00:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f5cb8b6c5f237afa2438ac766a53836e SHA-1: 4013594f5a290dd615ca937dd148909c5c3b98ff SHA-256: d8a42c71144a8be975c6bb55cfc011e25fa4818e8d092e290083b23edc274649
82 Risk Score

Malware Insights

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

The PDF document contains a lure related to 'free printable Minecraft coloring pages' and a call-to-action to download a generator. It links to a malicious URL that likely hosts a second-stage payload or redirects to a phishing site. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple suspicious URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

Heuristics 4

  • 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.
  • 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/479516143/free-printable-minecraft-coloring-pages-game-hack PDF link annotation
    • http://bressanassessoria.com.br/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/minecraft-pocket-apk_GM479516143.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/free-coin-master-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/how-to-get-free-spins-on-coin-master-game_GM406889139.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_002_off00003481.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3481 24620 bytes
SHA-256: 8bbd821d4556b84ac1b916ac23865d5a30eb4b769965fce19f2284ba11abc94f
font_01_sfnt_off00006bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BDF 18384 bytes
SHA-256: b54cebd8b2bbc40deba01da3a93219bb66384243215780ac353a5f98c97c66c1

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