Malicious PDF — malware analysis report

Static analysis result for SHA-256 438aa83a65875eec…

MALICIOUS

PDF

43.1 KB Created: 2021-05-15 22:36:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: fc52f93ab77477b352be628a738cfc37 SHA-1: aa0b9bc79472f59678772a5e54e485321a6e5070 SHA-256: 438aa83a65875eec18faa769354e41e578e61d836dd5d95ad1f79b83667d08db
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link to a known malicious redirector, disguised as a 'game hack' generator. It also presents a fake CAPTCHA to trick users into interacting with the malicious link. The document body and embedded links suggest a lure for free in-game currency or items, a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.xyz/app/406889139/best-way-to-hack-coin-master-game-hack In PDF document text
    • http://www.nfca.org.tw/upload/files/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-exchange-40-free-spins_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coinmasterdailyfreespins-com_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/roblox-pics_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-on-facebook_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-get-minecraft-for-free-on-tablet_GM479516143.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-daily-free-spins-25_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/spinuri-gratis-coin-master_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/moonactive-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/hack-coin-master-spin_GM406889139.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_003_off000049ea.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49EA 25868 bytes
SHA-256: 758bdb4b4d1b80b9052bd2659e4bc60ffbe08a8751abf5d62ec21e495e0d7c7d
font_01_sfnt_off00008617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8617 18308 bytes
SHA-256: efd36867875b7c9e05accf83dcfb4edd17123817e8c4c99ad8b82f7777b7703f

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