Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ab5c7caf69204d6…

MALICIOUS

PDF

36.1 KB Created: 2021-07-03 19:12:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b03b4a396a79230305888662f79fe5bf SHA-1: 3b7e5286af20ef598e9c69def8327c8f3ee96249 SHA-256: 8ab5c7caf69204d6d1fffff971e5e1d1dae097ce4d89cdd8d288c285c7d65011
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links to a redirector URL, which is flagged as malicious and associated with game hack lures. The document body and embedded links promote 'free generators' and 'hacks' for popular games, aiming to trick users into clicking through to potentially harmful sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/406889139/coin-master-pet-food-hack-game-hack In PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/stealer-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-printable-roblox-images_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/hack-roblox-admin-dl_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-cheat-table-mm2_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-hack-games-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/hack-exploit-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/command-hacks-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-video-files-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/hack-app-for-roblox-pet-simulator-free-pets_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/hack-to-get-money-on-roblox-rocitizens_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-100-spin-hack_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-draw-2-roblox-kick-people_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-2021-hack_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
font_00_sfnt_off0000302d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x302D 22904 bytes
SHA-256: 6e50c0e0c4fae9dac6a8ffa7e5a487e1918e9322ac1ef7f460bea0e4780e18b1
font_01_sfnt_off0000637f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x637F 18496 bytes
SHA-256: 3efe635c010e4f7343278e6af4851d95998f8a18e6dc23db02e30b8169d2591e

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