Malicious PDF — malware analysis report

Static analysis result for SHA-256 27fccf557f6daa9b…

MALICIOUS

PDF

46.6 KB Created: 2021-06-03 13:43:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 06b2331a743b7bce38c3971cc46a8479 SHA-1: 91ce205437c390d14a7d3f4e019fb55e0ded32ec SHA-256: 27fccf557f6daa9b4b1b65235f78d562f60efd6b9b51eef490e31aed3e11e52d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'free generator / game hack' lures. The embedded URL `https://netcdn.online/app/406889139/daily-free-spins-coin-master-app-game-hack` is a primary indicator of this malicious activity. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a social engineering attack designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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 https://netcdn.online/app/406889139/daily-free-spins-coin-master-app-game-hack In PDF document text
    • http://digilib.unla.ac.id/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-facebook-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-download_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/gamesofficenet-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/create-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-hack-app-ios-download_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/tiktok-follower-bot-free_GM835599320.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-free-spins-and-coins-group_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/daily-coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-spin-links-coin-master-october-30-2021_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-free-spins-glitch_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050b2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50B2 24716 bytes
SHA-256: b8a4319b039f771304301a24397afb71d5cfe581748a703a1b8ded37c3d3bc15
font_01_sfnt_off0000898c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x898C 2824 bytes
SHA-256: a0d6c1ef1f7405ab05245801e4abbc2877925f97898db53811df9ab010e978fa
font_02_sfnt_off0000932a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x932A 18308 bytes
SHA-256: 72dba927d197b121f2f79f603316478a8fd74b1897291e20c9d2ace2afc386f7

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