Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42b87c536bf7a80…

MALICIOUS

PDF

49.1 KB Created: 2021-06-03 08:51:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4d5fc505f17cbed92991f184bbe1c604 SHA-1: 03a7813da96492c181ff76d903525761ca5efc71 SHA-256: f42b87c536bf7a8030160d538db7fc2a072ff06035feb1ea93b277456ef2e9f2
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a lure related to 'free Robux' and impersonates Facebook, directing users to a suspicious URL. This strongly suggests a credential phishing or malware distribution attempt. The ML classifier also flagged the PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.online/app/431946152/how-to-make-free-robux-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.online/app/431946152/how-to-make-free-robux-game-hack PDF link annotation
    • https://au-ma.com/image/data/files/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/coin-master-hack-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/coin-master-mod-version-free-download-v344_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/coinmaster-hack_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • https://au-ma.com/image/data/files/get-robux_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/how-to-get-roblox-credit-for-free_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/minecraft-114-4-download-free_GM479516143.pdfIn PDF document text
    • https://au-ma.com/image/data/files/coin-master_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-roblox-animations_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/coin-master-hack-root_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-robux-download_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_004_off00005317.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5317 26140 bytes
SHA-256: 3b3919ca87b2ed50218bb04132c37b93eb673ce489e1bebb293b8943dc372dee
font_01_sfnt_off00008eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EEE 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C00 18772 bytes
SHA-256: bc975d0cd3d1d09474d4302e54d359df6d5266f7e81f0636855fd998b44c4aca

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