Malicious PDF — malware analysis report

Static analysis result for SHA-256 39856587d3d613dc…

MALICIOUS

PDF

251.0 KB Created: 2021-07-06 16:43:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 83191a375e9fb23b52e685e1a8948715 SHA-1: da1ca0dd3b8e3b5d13583e2adcb99c0dc4e26942 SHA-256: 39856587d3d613dcdbefc05edcf3909ca948be737da7a5d93f41659d64e3ecb5
258 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1041 Exfiltration Over C2 Channel

The PDF document contains multiple heuristics indicating a credential phishing lure, specifically impersonating Apple and presenting a fake CAPTCHA or human verification prompt. It also includes a link to a known malicious redirector, http://netcdn.tw/app/1330123889/pubg-uc-voucher-game-hack, which is likely used to host the phishing page. The document's content and structure strongly suggest an attempt to trick users into providing sensitive information.

Machine Learning

  • Nyx PDF Classifier clean score 0.0098

Heuristics 8

  • 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-voucher-game-hack.
  • 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-voucher-game-hack In PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-set-hack-com_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/casper-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/hex-number-gives-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/new-hack-for-roblox-deathrun-2021-november-pc_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-do-hacks-in-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-hacking-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-groups-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-2021-pc_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-free-spin_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/tiktok-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-use-pastebin-for-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-bee-swarm-simulator-free-eggs_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
stream_024_off00037eed.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37EED 26028 bytes
SHA-256: a86c0a7d552217e737a85afacbdeeba0ae905302a78d4d3b25794402b90c9224
font_01_sfnt_off0003bc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BC29 18568 bytes
SHA-256: f4710c35218edde494265432c93967086e05a68e3b9d69b6d0a4967a83694893

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