Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd12899dff4d2f76…

MALICIOUS

PDF

35.0 KB Created: 2021-07-03 16:41:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5bf5643dd50745dcbfa962a366cae13d SHA-1: 3e70ec7b61f137f310d3a60c8386d42320e278e4 SHA-256: fd12899dff4d2f76b246da948add9b3e4ac44a2e1bf18b5dec7484a798b2a23a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple heuristics indicating it is a malicious redirector, specifically targeting users interested in game hacks and generators. The primary URL, http://netcdn.tw/app/406889139/how-to-hack-coin-master-game-without-verification-game-hack, is flagged as malicious. The document body, though partially garbled, reinforces the theme of game hacking and includes the same redirector URL. No scripts were extracted, but the overall structure and content strongly suggest a phishing or malware distribution lure.

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/how-to-hack-coin-master-game-without-verification-game-hack In PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/vip-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-gift-link-hack_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/npq-game-hack-admin-game-steve-one-piece-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/www-roblox-com-free_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-hack-review_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-hack-freecam_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-free-food-for-pet_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/heroes-online-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-get-free-coins-on-tiktok_GM835599320.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/minecraft-pocket-edition-mods-for-free_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-gamepass-script-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/can-pokemon-go-free-account_GM1094591345.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/cheat-engine-cheat-table-for-roblox-2021-windows-7_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/can-you-get-legitimate-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/www-bandicam-com-free-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
font_00_sfnt_off000030aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30AA 22864 bytes
SHA-256: da055dc435bff5ab7246f30cfaf542272b25e6c6fcad2ea2e783821c31ed0787
font_01_sfnt_off000063d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63D9 19064 bytes
SHA-256: a8480d21748a50bcf9ac3d5cfbc0b0018be210baedebb5c1ff04cbf62fe825be

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