Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4a4e53c13e30cf…

MALICIOUS

PDF

36.5 KB Created: 2021-07-07 02:54:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3eac649c7af9d82fee00245760470a0f SHA-1: 017adb40b9a69532de7c3b37e8bcc1b90eb9e154 SHA-256: 3e4a4e53c13e30cf962cf605e80acfe250dd0578028442aac0081af4de7d5908
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are disguised as 'free Robux' or 'game hack' generators. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a campaign to drive traffic to potentially malicious sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links.

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/free-robux-without-verify-game-hack PDF link annotation
    • https://e-learning.mtsn1bojonegoro.sch.id/__statics/gudangsoal/files/how-to-get-book-wings-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn1bojonegoro.sch.id/__statics/gudangsoal/files/mcmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn1bojonegoro.sch.id/__statics/gudangsoal/files/deadly-sins-online-roblox-hack_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn1bojonegoro.sch.id/__statics/gudangsoal/files/noob-vs-pro-vs-hacker-roblox-blob-simulator_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn1bojonegoro.sch.id/__statics/gudangsoal/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn1bojonegoro.sch.id/__statics/gudangsoal/files/roblox-scam_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn1bojonegoro.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-inspect-element-2021_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn1bojonegoro.sch.id/__statics/gudangsoal/files/coin-master-card-collection-hack-apk_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn1bojonegoro.sch.id/__statics/gudangsoal/files/free-coins-coin-master-daily_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn1bojonegoro.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-no-verifying_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn1bojonegoro.sch.id/__statics/gudangsoal/files/roblox-rules_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn1bojonegoro.sch.id/__statics/gudangsoal/files/roblox-work-at-a-pizza-place-manager-hack_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn1bojonegoro.sch.id/__statics/gudangsoal/files/free-robux-youtube_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn1bojonegoro.sch.id/__statics/gudangsoal/files/roblox-project-pokemon-exp-hack_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn1bojonegoro.sch.id/__statics/gudangsoal/files/minecraft-java-edition-free-code_GM479516143.pdfIn PDF document text
    • https://e-learning.mtsn1bojonegoro.sch.id/__statics/gudangsoal/files/hacks-for-roblox-no-human-vertifcation_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn1bojonegoro.sch.id/__statics/gudangsoal/files/150-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn1bojonegoro.sch.id/__statics/gudangsoal/files/coin-master-golden-card-hack_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn1bojonegoro.sch.id/__statics/gudangsoal/files/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • https://e-learning.mtsn1bojonegoro.sch.id/__statics/gudangsoal/files/roblox-btools-script-free_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
font_00_sfnt_off0000368d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x368D 22324 bytes
SHA-256: 881d82b085c39629592e1cf89eafc59359f1dd499f82a3588178a66c5c9b9944
font_01_sfnt_off00006812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6812 19620 bytes
SHA-256: 8aa86329d0795ab1cad193d913199e82be4c5431cadd1cc96f2f7af8a2f6b0e0

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