Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dd1ff5c71b9522b…

MALICIOUS

PDF

34.4 KB Created: 2021-07-03 12:19:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 67f42056a1ca77a5857c71ff2ad41eb3 SHA-1: 11ae3fbb0e3339c8262aa36985f166ad8c6fa3b6 SHA-256: 1dd1ff5c71b9522b11b734ab58fd76ca7762edbd0cd831d98f2e1d4c39228ace
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one to a known malicious redirector infrastructure at http://netcdn.tw/app/431946152/free-robux-picture-verification-game-hack, disguised as a 'free generator / game hack'. The document body and heuristics indicate a lure for free Robux, likely leading to a scam or malware download. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/free-robux-picture-verification-game-hack In PDF document text
    • http://stikespantirapih.ac.id/home/repository/can-you-hack-your-own-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/invisible-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-hack-into-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-hacke-auf-spaghetti-id_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-hair-roblox-boy_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-hack-in-arsenal_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/discord-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-avatar-free_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-hack-in-ar-in-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/hack-youtube-roblox-game_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/is-minecraft-free-on-computer_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coinmaster-fan-page_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-free-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-roblox-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-free-spins-hack-iphone_GM406889139.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_off00002fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FC5 22288 bytes
SHA-256: 9e771f37e73f705f03ef642248cbc8dba98e4154b6323a566bd7419b8ab6ed01
font_01_sfnt_off000060f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60F2 19228 bytes
SHA-256: f240099ec94a3952d002d5cd7f1fa72b0c4930db4b6327e4aabbfeba5b3d54ac

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