Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c85ee72fed1da8…

MALICIOUS

PDF

35.4 KB Created: 2021-07-06 01:33:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8a5a77d2e46dae964dcca751d12d0f0a SHA-1: 7bc5cff8e0651b4f12aca3bc6857e506af3b48dd SHA-256: a2c85ee72fed1da800d85f8be49fb808086c0dccca25a5f084b1c216842a822f
180 Risk Score

Malware Insights

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

The PDF document contains multiple links disguised as generators for in-game currency and items, such as 'free Robux'. One critical heuristic identified a malicious redirector link, and another flagged a URI pointing to a raw IP address, indicating a likely phishing or malware distribution attempt. The document body, though partially garbled, reinforces the lure of free in-game items, and the presence of embedded URLs suggests an attempt to redirect the user to malicious infrastructure.

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.
  • 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.
  • 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.tw/app/431946152/how-to-get-free-robux-2021-game-hack In PDF document text
    • http://118.98.227.172/opac/repository/official-coin-master-free-spins_GM406889139.pdfPDF link annotation
    • http://118.98.227.172/opac/repository/free-brown-pant-roblox_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/free-robux-from-gravel-pit_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/daily-free-spins_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/free-roblox-accounts-2021-with-obc_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/cute-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/roblox-pokemon-go-game-free_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/wwwfree-robux-todaycom_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/roblox-boxing-simulator-2-hack-strength-script_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/robux-free-c_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/coin-master-35-16-hack-apk_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/free-account-that-have-robux-that-are-100-real_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/free-roblox-promo-codes-september-2021_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/minecraft-free-install_GM479516143.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/cheate-pour-roblox-arsenal_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/roblox-parkour-points-hack_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/free-spins-coins-coin-master_GM406889139.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_off000031ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31EE 22540 bytes
SHA-256: f7adf7ea393ff3dee65b0b2b93a3ffaaa8bff72ae6a86b7c950e55b5661fa622
font_01_sfnt_off0000644a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x644A 19384 bytes
SHA-256: 140efaa19506918d6e23c6f72929d04436b836b18eb9dc717a4a442c24a9fe38

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