Malicious PDF — malware analysis report

Static analysis result for SHA-256 d22e7aff32350aee…

MALICIOUS

PDF

32.8 KB Created: 2021-07-03 16:44:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 405ec630286ee394e19bf19ec44d6a9b SHA-1: d20592336c56c85e1e6f1dd6fd63514fccbc2a82 SHA-256: d22e7aff32350aeec597c8b85f7da40a04a9612c3cad4dd005a1bd8742ec8921
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including a primary redirector to 'netcdn.tw' and a large number of SEO-optimized links pointing to 'lib.kunci.or.id'. These links are designed to lure users into clicking on them by promising game hacks and free currency, a common social engineering tactic. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector and link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/406889139/50-free-spins-coin-master-links-game-hack In PDF document text
    • http://lib.kunci.or.id/repository/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-hack-roblox-for-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/daily-coin-master-link_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/minecraft-tower-defense-2-hacked_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/ways-to-get-robux-without-hacking_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/hack-de-robux-al-instante-gratis_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-minecraft-for-free-2021_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/8bp-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-airport-roblox_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-games-at-robloxcomdeveloper-tools_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/admin-commands-script-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-speed-hack-pastebin_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/mangocheats-com-hack-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-robux-credit-card-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-unlimited-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-rixty-codes-for-robux_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
stream_001_off00002a42.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2A42 22560 bytes
SHA-256: 1c35552b2fd1b48a7432b5c21486dc133208ba5aa09ce35c89d1424b95278ed1
font_01_sfnt_off00005cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CBA 18648 bytes
SHA-256: 7cb7b4aa4fe43c538a35ca12efa1607bb190a4a0226e989e68a2df4e99bf3741

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