Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2b210afa70c9fe…

MALICIOUS

PDF

43.0 KB Created: 2021-06-03 14:08:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 723b97ea32bd0f52f078e62abaaf8da3 SHA-1: dc25a11fdbee0916e30728995f5bc5e51e55542a SHA-256: 4d2b210afa70c9fe9b507493dda71ca33946c17bb48adc49527a874dfcb5369f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting a 'free generator / game hack' lure. The primary malicious URL identified is https://netcdn.online/app/406889139/200-free-spins-coin-master-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious redirector designed to lure users into clicking on potentially harmful links, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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/406889139/200-free-spins-coin-master-game-hack In PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-and-spin_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/can-i-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/daily-free-coin-and-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/google-roblox-games_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-printable-roblox-coloring-pages_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-com-redeem_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/robux-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/pokemon-go-free-app-download_GM1094591345.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/minecraft-java-edition-free-code_GM479516143.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_off00004bc8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BC8 25400 bytes
SHA-256: b334cd29484289d9339e8e5bb1d2ebc7c20345860139ad67093cffe67d0122d5
font_01_sfnt_off00008574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8574 18180 bytes
SHA-256: 322b0d5b629f6df55fd3c77851cbfe7ee71104dfe1b9214827344950ced1d0df

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