Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1818d9e7aa6b07…

MALICIOUS

PDF

49.0 KB Created: 2021-06-03 06:22:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9185769db1378afbe00a5f43cc7f04ee SHA-1: 990f124390049891bbe3e4c47670a79a047952ea SHA-256: 9b1818d9e7aa6b07c2f87f686da51e937a2c1c28cf8c3b6127bfc439fd458501
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting a 'free Robux game hack'. The document body and embedded artifacts suggest it is designed to trick users into clicking these links, likely leading to further malware downloads or phishing attempts. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/huskybuscom-free-robux-game-hack In PDF document text
    • http://library.stieyapan.ac.id/repository/cm-free-spins_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/roblox-troll-outfits-free_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-earn-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/real-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-spins-coin-master-october-13-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/tiktok-free-roblox-accounts-2021_GM835599320.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/bad-minecraft-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-get-free-hair-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-monster_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/who-hacked-ezrahandjacob-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/can-i-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-jackpot-hack_GM406889139.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_off00005039.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5039 28796 bytes
SHA-256: bebe8849020daea36f6d0fe4b56956b71b9f54feac3f4ed92efe8c189e4f3c25
font_01_sfnt_off00009274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9274 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off00009c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C27 18624 bytes
SHA-256: f893a3bff8774b7ed5d4e22eaab63b6b5727efd4274e33d815ecbde6c17ee355

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