Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f00a05f501b17d…

MALICIOUS

PDF

42.8 KB Created: 2021-06-04 02:18:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 91a06a3d15082985b9f0703248ee9730 SHA-1: 6e05949e2e6749de889c37d7f29192ba9bf98bc2 SHA-256: 36f00a05f501b17d21c6c82abe4e300ee287c3b4d2cb85ce36ac37fffcfa0ce8
200 Risk Score

Malware Insights

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

The PDF file impersonates Amazon, a common tactic for credential phishing. It contains a link that redirects to a malicious URL, which is likely intended to either steal user credentials or download a secondary payload. The ML classifier and specific heuristics strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 5

  • 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.
  • 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/835599320/tiktok-comments-free-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
  • 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/835599320/tiktok-comments-free-game-hack In PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/coin-master-fb-free-spins-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/coin-master-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/pubg-uc-60_GM1330123889.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/free-generator_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/free-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/500-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/krnl-download_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/roblox-2021-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/roblox-exploit-download_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/minecraft-free-download-apk-softonic_GM479516143.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/hack-free-spin-coin-master_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_004_off00004e18.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E18 24432 bytes
SHA-256: 63b6ae735b5c9aaf087a761cfdcecf36cae0f69c9ed0c1133b14500c993ddf27
font_01_sfnt_off00008666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8666 17716 bytes
SHA-256: 7d11e26bc137394c80b9b8e9d0677cc530b42dd3bf172d18943544e921c1513e

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