Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd1780dcba87b57…

MALICIOUS

PDF

34.6 KB Created: 2021-07-08 00:33:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 150428e9d330a860ac95b2f22a181cdd SHA-1: 49f7dfefb79ff2a5f6251b46e37cfdc2924b30e5 SHA-256: bbd1780dcba87b57c3fa5d64e091047a737b7499068bd8976583828cd66d4c8f
160 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a game hack redirect lure, pointing to malicious infrastructure at http://netcdn.tw/. The document body also contains this URL, reinforcing the lure. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. No scripts were extracted, but the embedded URL and redirector behavior suggest an attempt to lead the user to a malicious site, likely for further exploitation or credential harvesting.

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/479516143/how-to-get-minecraft-for-free-on-xbox-one-game-hack In PDF document text
    • https://e-learning.mtsn1purwakarta.sch.id/__statics/gudangsoal/files/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn1purwakarta.sch.id/__statics/gudangsoal/files/robux-free-nuevo-hack_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn1purwakarta.sch.id/__statics/gudangsoal/files/free-spins-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn1purwakarta.sch.id/__statics/gudangsoal/files/coin-spin_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn1purwakarta.sch.id/__statics/gudangsoal/files/coin-master-latest-version-hack_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn1purwakarta.sch.id/__statics/gudangsoal/files/minecraft-free-version_GM479516143.pdfIn PDF document text
    • https://e-learning.mtsn1purwakarta.sch.id/__statics/gudangsoal/files/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn1purwakarta.sch.id/__statics/gudangsoal/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn1purwakarta.sch.id/__statics/gudangsoal/files/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn1purwakarta.sch.id/__statics/gudangsoal/files/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn1purwakarta.sch.id/__statics/gudangsoal/files/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn1purwakarta.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn1purwakarta.sch.id/__statics/gudangsoal/files/robux-win-redeem-code-hack_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn1purwakarta.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-march-2021_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn1purwakarta.sch.id/__statics/gudangsoal/files/free-minecraft-skin-creator_GM479516143.pdfIn PDF document text
    • https://e-learning.mtsn1purwakarta.sch.id/__statics/gudangsoal/files/coin-master-fun-hack-online_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn1purwakarta.sch.id/__statics/gudangsoal/files/https-oprewards-com-roblox_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn1purwakarta.sch.id/__statics/gudangsoal/files/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • https://e-learning.mtsn1purwakarta.sch.id/__statics/gudangsoal/files/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn1purwakarta.sch.id/__statics/gudangsoal/files/roblox-hack-twisted-murderer_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_off00003477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3477 21424 bytes
SHA-256: f8bb7f4721dbca766ff2682f719353126a2d4910abd9647f5833e95f13489403
font_01_sfnt_off00006316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6316 18756 bytes
SHA-256: d5ec30f65413d7db6993b9641d1e97629dc650179ebea3b1673208637b129ed3

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