Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c92d595dea1a50c…

MALICIOUS

PDF

42.9 KB Created: 2021-05-18 04:13:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f40f936c5670889d3fff0f321ed75a59 SHA-1: bdea554b6151af121e6068b03f7f8e08c321a390 SHA-256: 5c92d595dea1a50cdff63181925909f1836bf37e85de2e138e90361b8d496ea4
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple links designed to redirect users to malicious websites, masquerading as game hacks or generators. The ML classifier strongly indicated maliciousness, and the presence of numerous external links, including a known malicious redirector, supports this. While no scripts were extracted, the document's structure and embedded URLs suggest it's part of a phishing or scam campaign.

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/431946152/jailbreak-roblox-hack-game-hack In PDF document text
    • http://mbbs.hr/files/hacks-for-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-spin-link-free_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-spins-link-2021-ios_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/freespinandcoinblogspotcom-2021-11-coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-spin-link-today-download_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/get-free-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/40-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/free-spins-for-coin-masters_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/websites-that-give-free-robux_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_003_off000047cf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47CF 26560 bytes
SHA-256: 1e5ad49c766dcf5e2f69ef7a7eb5830c7600619c22b8e6962d43b12acce377f7
font_01_sfnt_off000084b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84B1 18468 bytes
SHA-256: 47180ef6fd58f08eabdcf8de8850cf434555edaa977bcc29afa6d0c928aef64e

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