Malicious PDF — malware analysis report

Static analysis result for SHA-256 971ae145e4e92248…

MALICIOUS

PDF

45.8 KB Created: 2021-06-04 03:55:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 00814f335aab8dab74f64d8db7b6a613 SHA-1: 80dc1dc953f9f62cc9f5415878e711e15bb56782 SHA-256: 971ae145e4e92248dbe3af85df1e6a9ade4c41e0e27ef579b3f1b2bfb97141c5
160 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links, specifically pointing to a 'free generator / game hack' lure. The embedded URL, https://netcdn.online/app/431946152/codes-how-to-get-free-robux-game-hack, is associated with malicious redirector infrastructure. The document body, though partially corrupted, contains text related to 'free Robux' and the malicious URL, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.online/app/431946152/codes-how-to-get-free-robux-game-hack In PDF document text
    • https://opac.itp.ac.id/repository/master-free-spin_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-roblox-wings_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/download-coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/how-to-download-wurst_GM479516143.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-spins-coin-master-november-2021_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/coin-master-email-rewards_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/minecraft-free-download-apk-softonic_GM479516143.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-spin-link-for-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/bloxton-interview-center-anti-cheat-roblox_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/coin-master-free-spin-today_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_off00005091.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5091 27932 bytes
SHA-256: b5cea550e1a0ce564e6b34b02a2287ece675478ed9dd8fcac2e98917187be211
font_01_sfnt_off00008fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FDD 18456 bytes
SHA-256: e7ed60d24a78ba6057de20e743a58d73d760a91b60c41324c250f3bd6f119d62

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