Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b2dbc01c4f4567…

MALICIOUS

PDF

34.7 KB Created: 2021-07-04 04:45:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ced23ac24f8a1e7dd8c09354975c8598 SHA-1: 3e3fdf7a7ba6b99669a4a89236574043a62dd8a4 SHA-256: 86b2dbc01c4f45674756164ff87ee53807c2ab2930fd28b7f874e22b3d1c4871
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains multiple links that redirect to known malicious infrastructure, specifically promoting 'Coin Master' game hacks and free spins. The document body and embedded URLs strongly suggest a lure for users seeking in-game advantages, which ultimately leads to a malicious redirector. The ML classifier also flagged this PDF with high confidence.

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/coin-master-daily-free-spins-and-coins-game-hack In PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/freer-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/roblox-hacks-for-mac_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-free-attack_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/get-free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/roblox-jailbreak-cheats-or-hacks_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-robux-link_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-hack-mad-city-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/is-roblox-free-on-nintendo-switch_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-hack-mod-game-download_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-time-hack_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-tiktok-followers-without-verification_GM835599320.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/original-roblox_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/roblox-boys-cheating-on-girl_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/daily-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://www.urcouponsdeal.com/2019/03/coin-master-In 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_off00003165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3165 22464 bytes
SHA-256: 9cffaf1a8067be9310d6749066d25cbf5b183335d3315684f382cd20efadb4af
font_01_sfnt_off00006392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6392 18772 bytes
SHA-256: a1dc96cae1db032b501f6986f060f4567329d4c170f8890bd2780cb4b8189df7

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