Malicious PDF — malware analysis report

Static analysis result for SHA-256 5423c5d0cbbb5957…

MALICIOUS

PDF

45.0 KB Created: 2021-05-13 18:35:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0dedd9b9869913b731748ac6b5861c7e SHA-1: 2dda04318473db94393d5d2153c6c9d5d92b1f46 SHA-256: 5423c5d0cbbb5957de93373aa74ca91580f2353d6475fb31d3df49972d48afa7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure related to game hacks and username changes, directing users to a malicious URL. This URL is identified as a known malicious redirector, likely intended to lead users to a phishing or malware download site. The ML classifier also flagged this PDF as malicious 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 https://netcdn.xyz/app/431946152/change-roblox-username-free-game-hack In PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/roblox-tracker_GM431946152.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/free-t-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/roblox-moderators_GM431946152.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/coin-master-hacks-for-android_GM406889139.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/hacks-for-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/free-roblox-generator-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/how-do-you-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/coin-master-free-spin-software_GM406889139.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/how-to-hack-coin-master-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/play-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://www.era.org.in/era/assets/uploads/ckeditor/files/archery-master-3d-hack-unlimited-coins-cheats_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b0e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B0E 28388 bytes
SHA-256: 9fd8270917ec1be54f4d575460884508bbc24f198fe94fb82e03bfcc3383f36b
font_01_sfnt_off00008bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB8 19076 bytes
SHA-256: ccbe2cbfd93c87dda4ae88ea57378c4fd35d5f9fd376cb1def2d05d8f185a132

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