Malicious PDF — malware analysis report

Static analysis result for SHA-256 6691c785493fca16…

MALICIOUS

PDF

37.5 KB Created: 2021-07-07 22:31:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 1589ef18aff491f41657e961d9c6edbf SHA-1: c8434a215a14bab61fe1042f79d0ddf0b3945290 SHA-256: 6691c785493fca161822307546193be45549ac0eb39b3c76f6bbb0f39114dc85
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains lures for game hacks and free items, directing users to malicious redirectors and a large number of SEO-spam links. The primary malicious URL identified is http://netcdn.tw/app/406889139/free-spins-from-coin-master-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a malicious workflow designed to lead users to potentially harmful content.

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/406889139/free-spins-from-coin-master-game-hack In PDF document text
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu//repository/is-minecraft-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu/repository/free-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu/repository/coin-master-free-spins-glitch_GM406889139.pdfIn PDF document text
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu/repository/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu//repository/coin-master-hacking-news_GM406889139.pdfIn PDF document text
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu//repository/download-hacked-games-com-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu/repository/coin-master-hacks-no-downloading_GM406889139.pdfIn PDF document text
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu/repository/rtool-pw-roblox-robux-generator-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu/repository/free-roblox-girl-shirts_GM431946152.pdfIn PDF document text
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu/repository/hack-dowloads-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu/repository/how-to-get-the-best-shirts-on-roblox-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu/repository/free-shirt-templates-roblox-olympique-lyonnais_GM431946152.pdfIn PDF document text
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu/repository/tener-hacks-en-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu/repository/robux-hacks-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu/repository/how-can-you-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu//repository/how-to-get-free-hair-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu/repository/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu/repository/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu//repository/100-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu/repository/how-to-hack-roblox-jailbreak-walls_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_002_off000037bf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37BF 24404 bytes
SHA-256: c131af3009779a18b9f4d1fdd82a92246a1bcf46ea771de7f22ffe9a0bd1adb4
font_01_sfnt_off00006f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F9A 18432 bytes
SHA-256: 65a21218908e78d3b3e13bb6de659cda5883429e2feafaff43c4666217260e5f

Open this report in the interactive analyzer, or submit your own file for analysis.