Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57915a11f4ce1aa…

MALICIOUS

PDF

34.7 KB Created: 2021-06-19 04:30:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: b89e9283cd1f2cb27c591fa554f51ab8 SHA-1: ecc9a51786c4ac74306f2ca5095b2253a71e19a0 SHA-256: f57915a11f4ce1aa783cf850b813bfb6793272b0787bfb898c5ee22bd7934c5d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links that redirect to malicious infrastructure, specifically targeting users interested in game hacks and currency generators for games like Roblox and Coin Master. The ML classifier strongly indicated maliciousness, and the presence of numerous redirector links confirms a malicious intent to lead users to potentially harmful sites. No scripts were extracted, but the document's structure and embedded links are designed as a lure for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/roblox-free-download-on-game-game-hack In PDF document text
    • http://perpustakaan.stikom-ima.ac.id/slims2/repository/coin-master-hacks-no-downloading_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikom-ima.ac.id/slims2/repository/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikom-ima.ac.id/slims2/repository/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikom-ima.ac.id/slims2/repository/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikom-ima.ac.id/slims2/repository/is-roblox-studio-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikom-ima.ac.id/slims2/repository/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikom-ima.ac.id/slims2/repository/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikom-ima.ac.id/slims2/repository/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikom-ima.ac.id/slims2/repository/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • http://perpustakaan.stikom-ima.ac.id/slims2/repository/tiktok-free-10-likes_GM835599320.pdfIn PDF document text
    • http://perpustakaan.stikom-ima.ac.id/slims2/repository/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikom-ima.ac.id/slims2/repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikom-ima.ac.id/slims2/repository/game-give-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikom-ima.ac.id/slims2/repository/conquerors-3-roblox-hack-script_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikom-ima.ac.id/slims2/repository/minecraft-free-apk-java-edition_GM479516143.pdfIn PDF document text
    • http://perpustakaan.stikom-ima.ac.id/slims2/repository/free-camera-not-activating-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikom-ima.ac.id/slims2/repository/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikom-ima.ac.id/slims2/repository/admin-free-robux-code_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikom-ima.ac.id/slims2/repository/haktutsin-2021-09-coinmaster50freespinandcoinlinkhtml-m-1_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikom-ima.ac.id/slims2/repository/how-to-hack-roblox-jailbreak_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
font_00_sfnt_off00003087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3087 22164 bytes
SHA-256: 3b949c7f5eb7038c8f97600fb6fc84fd6e7fe036d2017483a505ea61ccdf5ed1
font_01_sfnt_off0000618d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x618D 19416 bytes
SHA-256: 26be9ddda8727cd0fb7c917d77ee039b8e1af2bce889adf4789ea38bf577fa73

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