Malicious PDF — malware analysis report

Static analysis result for SHA-256 938b53660e9451d2…

MALICIOUS

PDF

35.4 KB Created: 2021-07-05 11:16:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: dd2aae1754794e9b7e50871ed784ef62 SHA-1: efc86deae785f502846b9932d0306b61618476f2 SHA-256: 938b53660e9451d2f1965de5599c0ca2153e1698812b079478d61ccd3c531785
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of game hacks and free currency to trick users into clicking malicious links. The embedded URLs, such as http://netcdn.tw/app/406889139/coin-master-how-to-get-japan-sushi-card-free-game-hack, are identified as belonging to known malicious redirector infrastructure. The document's structure and content strongly suggest it is designed to lead users to potentially harmful websites, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/coin-master-how-to-get-japan-sushi-card-free-game-hack In PDF document text
    • http://perpus.stikesphi.ac.id/repository/buy-for-free-roblox-builders-club_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-time-hack-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-shirt-for-kids-free-shipping_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/hack-to-train-railway-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-change-your-username-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-hack-cydia_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/hack-roblox-2021-genirator_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-hack-a-roblox-account-august-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-use-cheat-engine-67-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-script-pastebin-instent-in-promo-code_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-win-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-free-coins-link-facebook_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/minecraft-on-computer-free_GM479516143.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_002_off00003219.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3219 22960 bytes
SHA-256: 4244fd3363975cd6b4ab72bdf15ea33c221622e58fda86992ce7576b422135c9
font_01_sfnt_off000065cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65CF 18984 bytes
SHA-256: eeeec89113fe9ffd5234c042272db78e0426ead830ff3aefcc3754689b647ffc

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