Malicious PDF — malware analysis report

Static analysis result for SHA-256 3584d4cdaf6ada17…

MALICIOUS

PDF

35.1 KB Created: 2021-07-05 14:00:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1ae88b6cfc3cd2ecce9eecf40ba7fa9d SHA-1: 851ab719af2eebc8bbdd416090e5b584b61bb69a SHA-256: 3584d4cdaf6ada178c4c541025f5e5c67badeeeaab087cc6b27abd2b1c8f8c14
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which are SEO-optimized and point to sites offering game hacks and cheats. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a link farm designed to attract users with promises of illicit gains. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded URLs and the document body content, though partially corrupted, reinforce the lure of game exploits.

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/coin-master-game-hack-online-game-hack PDF link annotation
    • http://library.atim.ac.id/repository/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/pubg-uc-lucky-spin_GM1330123889.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-make-your-own-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/earn-rixty-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/hack-coin-master-apk-32_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-do-i-get-free-robux-without-scams-and-ads_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-tradeing-with-freinds_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/flip-master-free-coins_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-stands-online-cheats_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/innovation-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-infinite-jjump-script-hack_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-free-dominus-and-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-rewards_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-shirt-free-edit-avatar_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/mcmaster-club-coin-master-hack_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_002_off00003313.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3313 22972 bytes
SHA-256: 2f7a2b1c4a555cd7af56905279071f3f1e669718cefcb7799787a06808c6bf29
font_01_sfnt_off000066ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66AE 18336 bytes
SHA-256: 2c253a31a625c9619806f17d3067d340dfcb23f51fc85221a1c31aa1f7ecad8c

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