Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfafc4dd22071383…

MALICIOUS

PDF

33.8 KB Created: 2021-07-04 17:30:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 70ee2c11ff8370d9a3be6d5e9ce58400 SHA-1: 7647c274230055ffeae4f62adac3e151f65ca7e3 SHA-256: cfafc4dd2207138373aabea9a6cd9d8e17f44b0be1182dc2a0d34d5a16b9c6ae
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, specifically http://netcdn.tw/app/431946152/free-printable-roblox-images-game-hack, which is designed to lure users with promises of game hacks. The document body and embedded URLs reinforce this lure by mentioning 'Roblox', 'Robux', and 'game hack'. The presence of these links and the nature of the lure strongly suggest a phishing or scam attempt, likely intended to lead users to a malicious site or download unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.tw/app/431946152/free-printable-roblox-images-game-hack In PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/is-coin-master-free_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/3-roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-legit_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/trouver-la-partie-dun-joueur-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-coins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/pastebin-roblox-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-iphone-hack_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/pokemon-go-free-egg-incubator_GM1094591345.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-kid-friendly_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/download-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/minecraft-pe-free-ios_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/minecraft-free-games-no-download_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-redeem-free-robux_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_001_off00002a3b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2A3B 23316 bytes
SHA-256: 79f468d5e96da479d99f5042ce045f11e6d3a18f0585c2a7e0184d4f6a9c2d55
font_01_sfnt_off00005ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5ECF 19288 bytes
SHA-256: 893b393260492bf9c9a6346802d9f989ad7bf132b46ed8b5a80628142bd2b1f2

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