Malicious PDF — malware analysis report

Static analysis result for SHA-256 b635aaeaeb0a67eb…

MALICIOUS

PDF

35.3 KB Created: 2021-07-05 20:35:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 15c5d8d3c7602b300e5976b80260dfa4 SHA-1: 022655f5dcddbc81587270bc7d41955da5e1fd28 SHA-256: b635aaeaeb0a67eb984be3d0b6d88b5b9aea28011c95c00de49d36fecc478d8c
160 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it's a malicious redirector, specifically targeting users interested in game hacks and free currency. The document body explicitly contains the URL http://netcdn.tw/app/431946152/how-to-get-free-robux-com-game-hack, which is flagged as a malicious redirector. This suggests the primary goal is to lead the user to a potentially harmful website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/how-to-get-free-robux-com-game-hack In PDF document text
    • https://elearning.mtsn2hsu.sch.id/__statics/gudangsoal/files/coin-master-hack-programers_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn2hsu.sch.id/__statics/gudangsoal/files/do-you-get-windows-10-minecraft-for-free-with-java_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn2hsu.sch.id/__statics/gudangsoal/files/get-roblox-builders-club-free_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2hsu.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn2hsu.sch.id/__statics/gudangsoal/files/roblox-www-com_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2hsu.sch.id/__statics/gudangsoal/files/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2hsu.sch.id/__statics/gudangsoal/files/coin-master-level-4_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn2hsu.sch.id/__statics/gudangsoal/files/roblox-hack-into-peoples-accounts_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2hsu.sch.id/__statics/gudangsoal/files/coin-master-hack-spins-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn2hsu.sch.id/__statics/gudangsoal/files/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn2hsu.sch.id/__statics/gudangsoal/files/coin-master-20-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn2hsu.sch.id/__statics/gudangsoal/files/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2hsu.sch.id/__statics/gudangsoal/files/robux-hack_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2hsu.sch.id/__statics/gudangsoal/files/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2hsu.sch.id/__statics/gudangsoal/files/free-robux-com_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2hsu.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn2hsu.sch.id/__statics/gudangsoal/files/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2hsu.sch.id/__statics/gudangsoal/files/app-store-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn2hsu.sch.id/__statics/gudangsoal/files/free-robux-no-survey-mobile_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2hsu.sch.id/__statics/gudangsoal/files/roblox-hacked-cliient_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
font_00_sfnt_off000031de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31DE 22648 bytes
SHA-256: a153b602c19146d4d793aaca7242f9c1a3df0c40ee4985cd52e61edbc058bad1
font_01_sfnt_off00006444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6444 19244 bytes
SHA-256: 2a82a6b4e88d45175d2fe2eaf287537d274cffbbed35dd56f8b6e767c09dfc54

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