Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c81ca7b968c45f9…

MALICIOUS

PDF

35.4 KB Created: 2021-07-03 17:47:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e7b84cb376fc67d317c6843fafca177c SHA-1: 34bcb081ceba35e45a0b57bf1b400f79e3d5002c SHA-256: 1c81ca7b968c45f9717a177e8726ffe4418c354d7b46d7ea8406ecbf4a589743
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising free generators and hacks for popular games. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs and a download button lure further supports a phishing or scam attempt. The primary goal appears to be directing users to malicious sites that likely host further malware or phishing content.

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-coins-and-spins-for-coin-master-game-game-hack In PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-daily-bonus_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/malilokawaii-hack-de-roblox_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/pokemon-go-free-dragonite_GM1094591345.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-coin-master-coins-2021_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-hack-strucid-aimbot_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-game-free-spin-download_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-egt-free-robux-robuxian-youtbe_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/earn-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-via-offers_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-hack-roblox-games-on-android_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-daily-free-spins-and-coins_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
font_00_sfnt_off0000341e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x341E 22664 bytes
SHA-256: aff92f14c4a1388898444b7a0718acbcbf3b83b61bbafd8de4ed843bbf997066
font_01_sfnt_off000066b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66B8 18608 bytes
SHA-256: 91e5d49199ad9387aaf7021f2d04de29590db1476a75f1a5b44edbca12b063d7

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