Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c39b428347f91d6…

MALICIOUS

PDF

44.4 KB Created: 2021-06-11 01:47:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9d36986c7a6be8a5dc61b98aa2978bf4 SHA-1: 55ecd0cd79ebf373a307eab3ea3ffdd1e70a46a9 SHA-256: 6c39b428347f91d6c393d5c3be6e97734eb65a842122cabce040cd946dc522b3
160 Risk Score

Malware Insights

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

This PDF document contains multiple links to a redirector URL, which is associated with malicious activity. The document body and heuristics indicate a lure for 'free game hacks' or currency, designed to trick users into visiting the malicious site. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/free-robux-codes-2021-no-human-verification-game-hack In PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/descargar-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/cool-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/real-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-dead-winter-infinity-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/minecraft-bedrock-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/2021-robux-hacks-no-games-to-be-played_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/spins-gratis-coin-master-hoy_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/4-tik-tok-free-followers_GM835599320.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-free-item-codes_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-hack-roblox-with-edit-this-cookie_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/minecraft-complete-handbook_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-apk-hack-32_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_off00004f58.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F58 24964 bytes
SHA-256: 04ffecea58acd86e4bfd511ca8b02205ed31da45e5b307481f0f884a7a54dcc3
font_01_sfnt_off00008753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8753 19436 bytes
SHA-256: 8378a2a37d370a0e024c1d065a0671da15f2a0deaf443a795abfe5abeb8e35b2