Malicious PDF — malware analysis report

Static analysis result for SHA-256 f025b95c496f264f…

MALICIOUS

PDF

45.8 KB Created: 2021-05-13 01:41:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 366dff5ebf8dee5a43112b0bc67cd264 SHA-1: 39f859c328c750eb2446dd21ac488ad6adccf774 SHA-256: f025b95c496f264f13e5f3f041ec1c7881627dc9f6a8e814a747239e5f43e540
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, 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 malicious score 0.9432

Heuristics 5

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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/406889139/free-coin-spin-game-hack PDF link annotation
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/free-spin-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/free-robux-survey_GM431946152.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/free-robux-please_GM431946152.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/500-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/coin-master-35-13-hack-download_GM406889139.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/wwwhaktutsin-2021-08-coinmasterfreespinandcoinlinkhtml-m-1_GM406889139.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/working-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/roblox-studio-free_GM431946152.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/how-to-change-your-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/coin-master-hack-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/coin-master-hack-no-verification-2021_GM406889139.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_off00004cf7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CF7 24604 bytes
SHA-256: e81212ea160178be6d6e8a9a1700e21d23030460410b1650e1260b31eacaf900
font_01_sfnt_off00008536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8536 4084 bytes
SHA-256: df85173feea72dc2f2189124c35b140faf44ef7a36f3496b492965e474480a3b
font_02_sfnt_off000092f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92F4 17552 bytes
SHA-256: f6733490f9e98ac1c6d381232fcc744520aff3fd481443809f2500373f365ecc

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