Malicious PDF — malware analysis report

Static analysis result for SHA-256 d89df9c5a9cb42f9…

MALICIOUS

PDF

34.2 KB Created: 2021-06-18 05:35:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0f6d30ea580908e2b40e5d44ba53e65e SHA-1: 3955d0990a555968649182d0be28275fd62f9f43 SHA-256: d89df9c5a9cb42f940f719087a017819dafc9ee0fb282cd01787590d06994137
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to a known malicious redirector, disguised as a game hack generator. The document body explicitly mentions 'Roblox Hack Robux Android 2021' and includes the malicious URL, indicating a lure for users seeking cheats or exploits. The presence of multiple similar URLs suggests a campaign distributing these lures.

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-hack-robux-android-2021-game-hack In PDF document text
    • http://library.ulb.ac.id/repository/flip-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-100k_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-free-pet-food-links_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-minecraft-windows-10-account_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-by-downloading-a-game_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-pro-hack_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-2021-feb_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-spins_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/is-roblox-free-on-pc_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-tiktok-video_GM835599320.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/rblx-free-robux-no-human-verification-209_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/tiktok-follower-bot-free_GM835599320.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/oprewards-robux-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/robux-hacks-that-work-2021_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_002_off00002cd8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2CD8 22572 bytes
SHA-256: 6ab9765f0059c5d56ebc43653206c13f5253e44eae9047c5fec7baf8cc74db4c
font_01_sfnt_off00005f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F40 19492 bytes
SHA-256: cd488479322282c86a6cd58fc6524cb5f689ab294f15e42a9f1571c4fbb719d3

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