Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba0a5da609e71eb…

MALICIOUS

PDF

33.4 KB Created: 2021-07-04 09:35:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1820972b899a6b028815436baeac91a0 SHA-1: aeb655d63128e40112b673454f8314f2e534c868 SHA-256: 9ba0a5da609e71eb5da1b0544a899342ce377a939938f7bd6bd0dca2a6968f54
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game hacks and robux to trick users into clicking malicious links. It contains numerous links to redirectors and link farms, including the primary malicious URL http://netcdn.tw/app/431946152/by-roblox-for-free-game-hack. The document body and heuristics indicate a social engineering tactic to drive traffic to potentially malicious content, likely for ad fraud or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/by-roblox-for-free-game-hack In PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/is-pokemon-go-free-to-play_GM1094591345.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/the-only-free-robux-game-that-works-1_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/bc-roblox-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-coins--spins-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-hacks-site_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/hacker-commands-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-hack-spin_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-fe-roblox-admin-scripts_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-roblox-codes-for-robux-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-darkness-2-cheats_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/can-you-make-shirts-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-roblox-gamepasses-2021-easy_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/beast-mode-face-roblox-free_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_off00002f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F69 21408 bytes
SHA-256: 137eea38f48c092993174b20570d4aa6f60300291750682d5724f792a53abdc0
font_01_sfnt_off00005e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E2C 18828 bytes
SHA-256: cd54b614093122abe51654aceb21cefc219f30a194cf313129b0c39011cd8702

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