Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ab9774d5ecb172…

MALICIOUS

PDF

34.8 KB Created: 2021-07-03 22:50:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 204a14e60f6535d8c1a88021de1c174c SHA-1: cc8f7f2797351556d68e78435807df5a0ae2ea1e SHA-256: d4ab9774d5ecb17207ea8e1d482bbf15767907fde1e279c9f5d6a8c0abda5ba0
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains numerous embedded URLs and a DOC BODY that references game hacking and free in-game currency, strongly suggesting a lure for users to download malicious files. The presence of a large number of external links, including a link farm heuristic, indicates a potential attempt to distribute malware or lead users to phishing sites. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/406889139/hack-game-coin-master-game-hack PDF link annotation
    • https://elma.alazhar.sch.id/__statics/gudangsoal/files/how-to-get-1-million-robux-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://elma.alazhar.sch.id/__statics/gudangsoal/files/apps-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://elma.alazhar.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://elma.alazhar.sch.id/__statics/gudangsoal/files/real-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://elma.alazhar.sch.id/__statics/gudangsoal/files/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://elma.alazhar.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • https://elma.alazhar.sch.id/__statics/gudangsoal/files/coin-master-hack-pc-cheat-engine_GM406889139.pdfIn PDF document text
    • https://elma.alazhar.sch.id/__statics/gudangsoal/files/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • https://elma.alazhar.sch.id/__statics/gudangsoal/files/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
    • https://elma.alazhar.sch.id/__statics/gudangsoal/files/how-do-you-get-free-food-on-coin-master_GM406889139.pdfIn PDF document text
    • https://elma.alazhar.sch.id/__statics/gudangsoal/files/fb-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://elma.alazhar.sch.id/__statics/gudangsoal/files/roblox-website-robux_GM431946152.pdfIn PDF document text
    • https://elma.alazhar.sch.id/__statics/gudangsoal/files/coin-master-daily-bonus_GM406889139.pdfIn PDF document text
    • https://elma.alazhar.sch.id/__statics/gudangsoal/files/coin-master-hack-2021-app-download_GM406889139.pdfIn PDF document text
    • https://elma.alazhar.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • https://elma.alazhar.sch.id/__statics/gudangsoal/files/give-me-robux_GM431946152.pdfIn PDF document text
    • https://elma.alazhar.sch.id/__statics/gudangsoal/files/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • https://elma.alazhar.sch.id/__statics/gudangsoal/files/roblox-free-shoulder-pets_GM431946152.pdfIn PDF document text
    • https://elma.alazhar.sch.id/__statics/gudangsoal/files/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • https://elma.alazhar.sch.id/__statics/gudangsoal/files/robux-robux_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_002_off000031bd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31BD 22968 bytes
SHA-256: 78aef742ca2bebed2497f84dc70af44a349dfba53da14578727fc7b7ad1ed44f
font_01_sfnt_off00006556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6556 18264 bytes
SHA-256: 5f1b6d09a0bad61aa3d888ffd8d12dad277b47eefc04d0416292618a0547d003

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