Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d688607655f5de0…

MALICIOUS

PDF

44.8 KB Created: 2021-06-03 09:16:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: ad20a72452284e0990a65f1f159d63c0 SHA-1: 4dd27be1bc72f3609b5a0002708fa3c318f7a164 SHA-256: 1d688607655f5de02969708816d3cfb3ad9365ca58912034fee9e8901fa5273d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including one identified as a malicious redirector, which is designed to lure users into downloading potentially unwanted or malicious software. The document body and heuristics indicate a deceptive lure related to game hacks and generators, suggesting a phishing or social engineering attack. No scripts were extracted from this sample, but the presence of malicious links and the deceptive content strongly indicate a malicious intent.

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.online/app/406889139/mcpe-master-coins-hack-download-game-hack In PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/minecraft-java-free-account_GM479516143.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/where-to-get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/by-pubg-uc-free_GM1330123889.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/spin-and-coin_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/hack-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-free-spin-no-offers_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/moonactive-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-roblox-script-executor_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/mcpe-master-coins-hack-download_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/tiktok-free-840-apk_GM835599320.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-microsoft_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
stream_004_off000051b5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51B5 25556 bytes
SHA-256: 8c2ca5ab82759d18cc32be11fbafffb2adc52c85f03ed7db3fdd59f8003205f5
font_01_sfnt_off00008be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BE6 18472 bytes
SHA-256: d90a51be2fb0e46f52fe818f09ffb57ced98c32b74c64ba127c312db9c6591fd

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