Malicious PDF — malware analysis report

Static analysis result for SHA-256 b942bc7b4cb733bc…

MALICIOUS

PDF

37.9 KB Created: 2021-07-03 13:29:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e90911188232819241af92e88f1d4f23 SHA-1: ea65fbf6bdcca023095435df34cbd0e1e47d1379 SHA-256: b942bc7b4cb733bcd579d6fa14adf353d92abecf0fbda755de7d69d8fcfe0ba0
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one to 'netcdn.tw', disguised as game hacks and generators. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or redirection to malicious sites. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though partially garbled, contains references to game hacks and URLs, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/easy-hack-on-roblox-game-hack PDF link annotation
    • https://digilib.stimlog.ac.id/repository/bloxland-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/downloading-roblox-link-free-like-no-money-needed_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/hack-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-dominus-roblox-javascript_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-speed-hack-roblox-booga-booga_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/code-for-free-skin-roblox-wild-revolvers_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-without-downloading-apps-for-ios_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/account-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-got-hacked-2021-video-and-evidence_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-without-surveys-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-level-4_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/game-empire-tycoon-roblox-hack-script_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-cheat-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roxploits-roblox-exploits-and-hacks_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/roblox-dinosaur-simulator-how-to-get-megavore-for-free-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-hack-someone-robloxs-account_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_off00003cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3CFB 22668 bytes
SHA-256: d01c97e5628da421648eda22ed6384177052e68c7bb7e0856afbf0d738ad191a
font_01_sfnt_off00006fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD8 18836 bytes
SHA-256: b5d0a276f5c98aa3f146c558b1c468a3201403ca029f85833a64b971c535d381

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