Malicious PDF — malware analysis report

Static analysis result for SHA-256 a238b4460c9e4bb1…

MALICIOUS

PDF

45.1 KB Created: 2021-05-12 00:31:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3edcf3709352fb5e6578a5c3953d18af SHA-1: c83ed28d0e2d1809d1cabb716b917d57d0a257d5 SHA-256: a238b4460c9e4bb11b24c767f2d0063e7c933400ce899531d6bb23467ccfb6b2
188 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and IP addresses, disguised as offers for free in-game currency. The document body and heuristics indicate a lure for 'free Robux' or 'game hacks', which is a common social engineering tactic. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a malicious workflow designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

Heuristics 6

  • 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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/free-robux-hack-no-human-verification-game-hack In PDF document text
    • http://192.168.0.99/%20%3Cp%3E%3Cp%3Eeasiest%20ways%20to%20get%20free%20robux%3Cp%3E%3Cp%3Ehow%20to%20get%20free%20robux%201%20min%3Cp%3E%3Cp%3E%3Cstrong%3EReferences:%3C/strong%3E%3C/p%3E%3Cp%3E%3Ca%20href=PDF link annotation
    • http://sebastiaanshoeve.nl/images/how-do-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://sebastiaanshoeve.nl/images/free-roblox-cards-pin-number_GM431946152.pdfIn PDF document text
    • http://sebastiaanshoeve.nl/images/is-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://sebastiaanshoeve.nl/images/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://sebastiaanshoeve.nl/images/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://sebastiaanshoeve.nl/images/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://sebastiaanshoeve.nl/images/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • http://sebastiaanshoeve.nl/images/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://sebastiaanshoeve.nl/images/coin-master-ios-gods-hack_GM406889139.pdfIn PDF document text
    • http://sebastiaanshoeve.nl/images/free-100-robux_GM431946152.pdfIn PDF document text
    • http://sebastiaanshoeve.nl/images/get-more-robux_GM431946152.pdfIn PDF document text
    • http://sebastiaanshoeve.nl/images/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://sebastiaanshoeve.nl/images/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://sebastiaanshoeve.nl/images/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://sebastiaanshoeve.nl/images/free-minecraft-codes_GM479516143.pdfIn PDF document text
    • http://sebastiaanshoeve.nl/images/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://sebastiaanshoeve.nl/images/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • http://sebastiaanshoeve.nl/images/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://sebastiaanshoeve.nl/images/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000487b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x487B 25136 bytes
SHA-256: d096a59c188ca628ffe59443986e31b8384791967363349c4542521e38ca7aab
font_01_sfnt_off00008294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8294 2824 bytes
SHA-256: bd082aa73fbb1a8b3bd2e5c998d3d8e31d1dfc71ea36f846af746f69a0d2ab7f
font_02_sfnt_off00008c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C48 18724 bytes
SHA-256: f128608ca7b0360be74441280d92b1e37bfcf1cb1333bfbd757be00147f1484f

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