Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1edb31ec0248fa…

MALICIOUS

PDF

52.9 KB Created: 2021-06-04 04:30:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0a38bb4b6cf3620210b1bc9382f1f3db SHA-1: 11d323a7176163eed6a4a44f3b1c7a71516c0e96 SHA-256: 4e1edb31ec0248fa9e97ff6219b4eae8d7651a03c6a82997ea5081f4258103a2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting "free generator / game hack" lures. The presence of multiple redirector links and the ML classifier's high confidence score indicate a malicious intent to lead users to potentially harmful content or further exploits. Although no scripts were explicitly extracted, the PDF structure itself facilitates the redirection, aligning with T1059.007 if JavaScript were embedded, or T1566.001 for the initial delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9614

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/free-robux-quiz-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-make-a-group-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/flame-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coins-for-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/microsoft-rewards-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/cool-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-coin-master-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/hack-xp-net-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-windows-free_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-game-download-mod-apk_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-minecraft-for-free-on-iphone-2021_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spin-app-apk_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-minecraft-wallpaper_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/tiktok-free-app-download_GM835599320.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-t-shirt-free_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-quiz_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-pc-2021_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_off000054dd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54DD 25584 bytes
SHA-256: d6b08fe277652ef009d86dd82bf37fe35bed80d75a902b22c01833368b8257bb
font_01_sfnt_off00008fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FCE 8704 bytes
SHA-256: 39621d468ee1ea45cfd77c2a5e31c688636f452f9f0cc0d9213932d691ddc971
font_02_sfnt_off0000ac3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC3A 18376 bytes
SHA-256: b52519a3f27e6183245bec6d77d3cda93d913202ea7147b0d6d9048d316cd5fc

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