Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2c16ca8516226c…

MALICIOUS

PDF

46.9 KB Created: 2021-06-03 23:52:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3e1e1e5e1b42bca8ccc8122baef2b694 SHA-1: d0ade7f9a58bbccf3b92a867a267dfefc13d9220 SHA-256: cd2c16ca8516226c529e9f816dea6e4e7b3f52941266ec0c2d066bcaef08f1ed
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting 'free game hacks' and 'spins'. The primary malicious URL identified is https://netcdn.online/app/406889139/free-coin-master-spins-daily-game-hack. This lure is designed to trick users into clicking through to potentially harmful content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/free-coin-master-spins-daily-game-hack In PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/100-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-free-coins-app_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-100-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-ios-hack-download_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/earn-points-for-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/how-to-hack-someones-minecraft-account_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-hack-for-android_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coinmaster-free-cards_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-gifts_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/get-free-cards-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/www-roblox-com-free-robux_GM431946152.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_004_off00005135.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5135 25380 bytes
SHA-256: 63befcd4577a003feb6f3c39eb478a21730c6fa1f8e8d075eaf36a76956ed5e8
font_01_sfnt_off00008ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AB2 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off00009465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9465 18308 bytes
SHA-256: 55b350ba652cc81c58cde26cd3be3a49d0b7ceb69ba015e6646fbbf561effc1c

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