Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7877257fdf5824…

MALICIOUS

PDF

46.2 KB Created: 2021-05-19 04:41:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: cd25cdd804ecb0498adfd72815dba191 SHA-1: e4e4da297def4cfeca67a5f46c1130edeafc8ea3 SHA-256: 9b7877257fdf5824769efee50203b05ab37e7c7881f0d75c2456f7c947ceaf42
160 Risk Score

Malware Insights

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

This PDF file contains multiple links to known malicious redirector infrastructure, specifically advertising a 'free generator / game hack'. The document body, though heavily obfuscated, contains references to these lures and the associated URLs. The ML classifier also flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

Heuristics 4

  • 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.
  • 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/406889139/free-spin-link-coin-master-today-game-hack In PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/free-robux-earn_GM431946152.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/minecraft_GM479516143.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/coin-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/get-robux-today_GM431946152.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/free-roblox-clothes_GM431946152.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-ultra-attack-hack_GM406889139.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-free-spins-and-coins-app-download_GM406889139.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/roblox-comcom_GM431946152.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-make-robux_GM431946152.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-hack-coin-master-apkmody_GM406889139.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/coinmaster-hack_GM406889139.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004eb6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EB6 25512 bytes
SHA-256: bf8499efd77186b4883a573be3419abd5e53f092ca77013f4a5aef011fc5c043
font_01_sfnt_off0000881b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x881B 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off000091cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91CD 18412 bytes
SHA-256: e587088874bde045b6c3de0610cebf0d89afe726cd39a539bf85554ca93a9bfa

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