Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b424e4c9ce324c…

MALICIOUS

PDF

35.4 KB Created: 2021-07-05 14:00:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d9e63a536d0c90c5e3070cd86757aba1 SHA-1: 47de350078af50f3c5317201493cb268cd106011 SHA-256: f7b424e4c9ce324ce9cba6b1981638fa675d7db52e5ee53f0815d0b76452c8c4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded links that redirect to known malicious infrastructure, specifically promoting 'free generator / game hack' lures. The primary link, http://netcdn.tw/app/406889139/free-spins-coin-master-2021-no-verification-game-hack, is identified as a malicious redirector. The document body and heuristics indicate a social engineering tactic to trick users into visiting these sites, likely for further malware delivery or credential harvesting.

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/free-spins-coin-master-2021-no-verification-game-hack In PDF document text
    • http://lib.stimykpn.ac.id//repository/pokemon-go-free-85_GM1094591345.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/earn-free-robux-videos_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/noob-vs-pro-vs-hacker-vs-god-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-tiradas-gratis-2021_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-source_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-download-free-for-chromebook_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-a-free-quirk-in-boku-no-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-redeem-code-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-hack-any-roblox-account-on-ipad_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-to-vbucks-translator_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hack-account_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-robux-and-tix-generator-free-download_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/frre-robux-hack_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-change-your-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-be-a-free-admin-on-roblox_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_off000031fa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31FA 23156 bytes
SHA-256: 414137d294c50e01d0a0d056db2041273bd9d2664baf8f81dae20068c7b48fbc
font_01_sfnt_off00006659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6659 18712 bytes
SHA-256: fa2afbad3b61103ca4936f2158142de1a2708134e66a615244795fafc55dd637