Malicious PDF — malware analysis report

Static analysis result for SHA-256 da699818d7023106…

MALICIOUS

PDF

250.9 KB Created: 2021-07-06 02:26:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9b0abb1529f2a340b452b4612e2f0626 SHA-1: 38da1b7017c8998f1ca838c035b1364f4be9c9a8 SHA-256: da699818d70231064fc9878bb6ad572d89f010264f7ce2ec41955a67111e371c
278 Risk Score

Malware Insights

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

The PDF document contains multiple heuristics indicating malicious intent, including a malformed stream, a link to a known malicious redirector, and lures such as a fake CAPTCHA and MFA prompt. The document impersonates Apple and directs users to a URL associated with game hacks, suggesting a phishing or credential harvesting attempt. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier clean score 0.0098

Heuristics 9

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.tw/app/1330123889/pubg-uc-murah-game-hack.
  • 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.
  • 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 http://netcdn.tw/app/1330123889/pubg-uc-murah-game-hack In PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/minecraft-apk-114_GM479516143.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/how-to-hack-roblox-with-brutis_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/roblox-free-shirts-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/coin-master-free-online-game_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/hacking-roblox-reddit_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/roblox-transparent-shirt-free-shipping_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/hack-coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/roblox-robux-generator-http-freerobuxgenerator-xyz_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/pastebin-free-robux-fast-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/roblox-free-name-changer_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/roblox-free-credit-card_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/how-to-hack-roblox-jailbreak-2021-mod-menu_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/coin-master-free-spins-and-coins-daily_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
stream_024_off00037ee7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37EE7 25928 bytes
SHA-256: f7d6ac55247dd1a3ada7aed3ed1c1f3e50606c995d7db5a0747465b2aec2794c
font_01_sfnt_off0003bc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BC06 18488 bytes
SHA-256: 7b4872c6df0e61f564b473bb7a2ff5e614156559a9be8c72cd19c5b01172c0e5

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