Malicious PDF — malware analysis report

Static analysis result for SHA-256 77fbbda2efb067c7…

MALICIOUS

PDF

34.9 KB Created: 2021-06-18 05:02:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 06ed97af0c320ca4ed94578bb2b0d07b SHA-1: 8afc13ba3b1cb9e80540f421b355c255b61f0f20 SHA-256: 77fbbda2efb067c7d3bfc139e3f0fba1a9939aa772f69ebaf027e8c954c8b00c
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malformed exploit stream and links to known malicious redirector infrastructure, specifically advertising a 'free generator / game hack'. The document body and embedded URLs reinforce this lure, directing users to download-related pages. While no scripts were explicitly extracted, the presence of exploit-related heuristics and the nature of the lure suggest an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.co/app/431946152/roblox-pet-simulator-how-to-get-a-free-dominus-game-hack In PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/roblox-hack-wideos_GM431946152.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/roblox-robux-hack-no-survey_GM431946152.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/free-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/roblox-hackeado-pc-gratis_GM431946152.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/pastebin-robux-hack_GM431946152.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/how-to-get-minecraft-dungeons-for-free_GM479516143.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/robux-free-pastebincom_GM431946152.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/how-to-hack-work-at-a-pizza-place-roblox-2021_GM431946152.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/how-to-earn-free-robux-no-password-no-email-address_GM431946152.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/hack-money-roblox-lumber-tycoon-2_GM431946152.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/roblox-restaurant-tycoon-free-money_GM431946152.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/hacker-game-in-roblox_GM431946152.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/how-to-get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/blox-piece-roblox-hack_GM431946152.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/roblox-free-boy-clothes_GM431946152.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/how-to-ranks-up-in-a-roblox-group-hack-easy_GM431946152.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/how-to-get-any-item-in-roblox-free-december-2021_GM431946152.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/cheat-codes-for-phantom-forces-roblox_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
font_00_sfnt_off00002fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FB6 22496 bytes
SHA-256: efe3b9fdbad28fac7f2c63cfd21a893cc0aeec3fd46f6c68caeefebb2677f741
font_01_sfnt_off00006216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6216 19576 bytes
SHA-256: d731dd058b653e282089a2bb8af7a9cf7bac47d289287c1f6a36d839af063087