Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db408f4b7013da3…

MALICIOUS

PDF

33.5 KB Created: 2021-07-05 14:26:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 90ff24ade8e26dc26f3328d507b5fa6a SHA-1: 0ae0dda4adce152e7123280d84af82deca4c3c69 SHA-256: 2db408f4b7013da30e896c94c637a6786d020e27b96891655500458f124b001d
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to game hacks and free currency, specifically mentioning 'Robux 2021' and 'game hack'. It contains numerous links to redirector sites and a link farm, indicating a phishing or scam attempt. The primary malicious URL identified is http://netcdn.tw/app/431946152/robux-2021-game-hack, which is flagged as a malicious redirector.

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/robux-2021-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-hack-a-account-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/is-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/roblox-promo-codes-2021-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-coins-and-spins-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-face-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/seven-v2-roblox-free-download-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-free-hair-boy_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-33-hack-version-download_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-minecraft-skin-packs_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/i-need-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-version-download_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hack-de-roblox-deathrun-descargar_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-live_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-food-for-foxy-in-coin-master_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_off00002e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E8F 21568 bytes
SHA-256: 8d09925c10879cd24b39351dec54e4e59f575441530f36f29ecdbfc42f1c8357
font_01_sfnt_off00005dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD0 18956 bytes
SHA-256: 03f490474d7ca969cd9c035121b9b885a49cfdd7fa0568d5688fc6c6f9ec8423

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