Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ace61d6f770239…

MALICIOUS

PDF

250.9 KB Created: 2021-07-10 03:40:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d1eecc53eccae065929c2b928868f4e8 SHA-1: 9df02b82c6399f53c34bb10d8edcc09511914a31 SHA-256: 26ace61d6f770239dd0bde50ffc307204a570bdd159b0f3785a0e9472ec17654
140 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a high number of heuristics related to credential phishing and fake CAPTCHAs, indicating a deceptive user interface. The embedded URL, http://netcdn.tw/app/1330123889/pubg-uc-app-download-game-hack, is presented as a download link for a PUBG UC app hack, which is a common lure for malicious applications. The document also impersonates the brand 'Apple', further supporting a phishing or credential harvesting motive.

Machine Learning

  • Nyx PDF Classifier clean score 0.0115

Heuristics 7

  • 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-app-download-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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-app-download-game-hack PDF link annotation
    • https://alisa.com.tw/upload/files/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://alisa.com.tw/upload/files/free-coin-master-coins-2021_GM406889139.pdfIn PDF document text
    • https://alisa.com.tw/upload/files/hack-week-2021-roblox_GM431946152.pdfIn PDF document text
    • https://alisa.com.tw/upload/files/roblox-free-mask_GM431946152.pdfIn PDF document text
    • https://alisa.com.tw/upload/files/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • https://alisa.com.tw/upload/files/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • https://alisa.com.tw/upload/files/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • https://alisa.com.tw/upload/files/roblox-vamprire-hunters-2-wall-hack-download_GM431946152.pdfIn PDF document text
    • https://alisa.com.tw/upload/files/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • https://alisa.com.tw/upload/files/spin-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://alisa.com.tw/upload/files/how-to-get-girl-hair-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • https://alisa.com.tw/upload/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • https://alisa.com.tw/upload/files/free-roblox-accounts-with-lifetime-obc_GM431946152.pdfIn PDF document text
    • https://alisa.com.tw/upload/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://alisa.com.tw/upload/files/free-roblox-bc-code-generator_GM431946152.pdfIn PDF document text
    • https://alisa.com.tw/upload/files/roblox-admin-hack_GM431946152.pdfIn PDF document text
    • https://alisa.com.tw/upload/files/roblox-phantom-forces-hack-2021_GM431946152.pdfIn PDF document text
    • https://alisa.com.tw/upload/files/easy-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://alisa.com.tw/upload/files/how-to-get-free-vip-in-roblox-fashion-famous_GM431946152.pdfIn PDF document text
    • https://alisa.com.tw/upload/files/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_024_off00037c9d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37C9D 26180 bytes
SHA-256: 24346a2aad6ec30923ca64229aec82e76b83235b418ef774af324f3584766462
font_01_sfnt_off0003ba0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BA0A 19024 bytes
SHA-256: 89eeb47e13d2823e0e0f96312797d0e2095f008ee89c25a0af7ca156b5f412c8

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