Malicious PDF — malware analysis report

Static analysis result for SHA-256 8637918d0c85efea…

MALICIOUS

PDF

46.7 KB Created: 2021-06-03 09:53:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5e71492f8af7c6eccce0bc0095a14f5d SHA-1: 500211df5751ce46104df73b4f2464d8f2de9cdd SHA-256: 8637918d0c85efea91970e683d816ec01a1e070591aaf6085d4e2904ec15badf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that lead to a known malicious redirector, specifically advertising 'free Robux' and 'game hacks'. The document body text and heuristic firings confirm this lure-based approach. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a potential for JavaScript execution or further redirection to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.online/app/431946152/you-promised-my-son-free-robux-game-hack In PDF document text
    • https://www.astrospace.com.tw/upload/files/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/roblox-bux-free_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/minecraft-windows-10-edition-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/robux-free-online_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/how-to-get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/coin-master-app-hacks_GM406889139.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/coin-master-heaven_GM406889139.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/free-robux-exe_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/coin-master-free-pet-food_GM406889139.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/free-tiktok-followers-generator_GM835599320.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_004_off00005131.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5131 28416 bytes
SHA-256: 926dd69ee81c5cf3645be46bbca84cd612349dbeb4eb005e591641e3fce42eb2
font_01_sfnt_off00009184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9184 19260 bytes
SHA-256: 86e86c6d1a3146e1f407edd8c9cf68c56566e4a3a2a05930f639aef478547eb3

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