Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7efeccd0157dc01…

MALICIOUS

PDF

34.2 KB Created: 2021-07-03 14:06:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 55121ffd2244615ad9af316d23cd151d SHA-1: e22e09adc860c37b12747c89218456a0ac978e8b SHA-256: d7efeccd0157dc016f256b0bc12353e412ef34c3baba83aa121027f37f529e93
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links and references to 'free Robux' and game hacks, a common lure for phishing and scam operations. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' and the presence of many external URLs pointing to similar content strongly suggest a malicious intent to redirect users to potentially harmful 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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/431946152/roblox-survey-for-robux-game-hack PDF link annotation
    • https://elearning.mtsn1medan.sch.id/__statics/gudangsoal/files/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1medan.sch.id/__statics/gudangsoal/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1medan.sch.id/__statics/gudangsoal/files/coin-master-hack-blog_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1medan.sch.id/__statics/gudangsoal/files/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1medan.sch.id/__statics/gudangsoal/files/can-you-get-free-robux-on-cheat-enine_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1medan.sch.id/__statics/gudangsoal/files/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1medan.sch.id/__statics/gudangsoal/files/how-to-get-admin-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1medan.sch.id/__statics/gudangsoal/files/free-promo-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1medan.sch.id/__statics/gudangsoal/files/roblox-scam_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1medan.sch.id/__statics/gudangsoal/files/free-roblox-shoulder-pets_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1medan.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn1medan.sch.id/__statics/gudangsoal/files/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn1medan.sch.id/__statics/gudangsoal/files/roblox-hack-gui-scripts_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1medan.sch.id/__statics/gudangsoal/files/roblox-emergency-response-liberty-county-hack_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1medan.sch.id/__statics/gudangsoal/files/how-to-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn1medan.sch.id/__statics/gudangsoal/files/get-2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1medan.sch.id/__statics/gudangsoal/files/free-robux-pastebin-no-save_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1medan.sch.id/__statics/gudangsoal/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1medan.sch.id/__statics/gudangsoal/files/hack-game-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1medan.sch.id/__statics/gudangsoal/files/coin-master-500-free-spins_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
font_00_sfnt_off00002f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F54 22172 bytes
SHA-256: 13b89f251a58d0f24237e76f18686ae499fdd33e420bf2e7063f50d5809384ad
font_01_sfnt_off00006058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6058 19084 bytes
SHA-256: 893d2a0cac65a37e8e0cc393c67cc8dfc8499afef1862ff833e0c4a24b58b29a

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