Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b13a7a3969338b…

MALICIOUS

PDF

46.8 KB Created: 2021-06-03 05:24:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a409b0303cc5c455e9429133b3473c3a SHA-1: baccab8555c2be84f40a1c4146f0f408c0b7d1f1 SHA-256: 81b13a7a3969338b23902e8439c2cd0444f4637dca4caac64b300c747a60c16f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to malicious redirectors and websites offering game hacks and cheats, indicating a social engineering lure for potentially unwanted or malicious software. The primary link, https://netcdn.online/app/406889139/coin-master-hack-game-download-mod-apk-game-hack, is flagged as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to drive users to external malicious content, likely as a form of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/coin-master-hack-game-download-mod-apk-game-hack In PDF document text
    • http://www.rewaqousha.net/userfiles/files/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/download-hacked-games-coin-master_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/spin-and-coin_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/coin-master-free-spins-2021-apk_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/hacks-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/50-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/free-minecraft-skins-ps4_GM479516143.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/minecraft-windows-10-free-trial_GM479516143.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/www-free-robux_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/free-roblox-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/coin-master-fan-page-giveaway_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/hack-coin-master-dzooka_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/coin-master-free-spins-link-ios_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005214.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5214 23776 bytes
SHA-256: 221eae3399818149b58bcb4858c5985acb4417f5bdcd19b56edef336e37384d2
font_01_sfnt_off000087c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87C0 3124 bytes
SHA-256: 9967c6221325a4ff3f7c4336922605f990450164c2eee2df708cc81823c6ec98
font_02_sfnt_off0000929f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x929F 18732 bytes
SHA-256: 3b2a882a3eab689f8cc2f919f0b1382fe93a3de56946d789c538445f453e6892

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