Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b0d41b7d1c1c72…

MALICIOUS

PDF

46.5 KB Created: 2021-06-11 12:46:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 7c3e30d8fc2593085beb61d4b1136840 SHA-1: 099608594484e817a9c452f4e77ed1c6192f6744 SHA-256: 90b0d41b7d1c1c72dd92fb3997abc307f3a76ad72ce7c017749a706245c86616
200 Risk Score

Malware Insights

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

This PDF document employs a lure related to game hacks and free generators, impersonating Amazon to trick users into clicking a malicious link. The link leads to a known malicious redirector infrastructure, indicating a phishing or credential harvesting attempt. No scripts were extracted, but the document's structure and embedded links strongly suggest a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/roblox-granny-hack-money-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.tw/app/431946152/roblox-granny-hack-money-game-hack In PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/minecraft-realms-free-codes_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/tiktok-free-real-likes_GM835599320.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-hack-ios-download_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/minecraft-download-free-download_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/get-more-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/tiktok-followers-generator-free_GM835599320.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-spin-appscoin-master_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-minecraft-accounts-2021_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-coin-master-credit_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/pokemon-go-free-trainer-codes_GM1094591345.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-hack-roblox-accounts-2021-june_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/seraph-roblox-download-free_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/robux-survey_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/cute-free-hair-on-roblox_GM431946152.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_off00005167.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5167 29848 bytes
SHA-256: e23ba348c5bdca5510256aa1d06982e024dab5ffc8fa8637cd24aae661059d81
font_01_sfnt_off00009268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9268 18560 bytes
SHA-256: 7a27a5898f6fc388895eddfa090708cef916135f334a648ffdc8653c455d8b1d

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