Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9589b980fb3bf5f…

MALICIOUS

PDF

35.6 KB Created: 2021-07-09 01:43:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c4c8ceac3dfc717e26f051451be58728 SHA-1: 45a19aeae83a28dd0e1273566359d8b6f843730a SHA-256: c9589b980fb3bf5f9531638d292775ecbf2b077761afd34731cd829a74b96357
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document employs a lure related to game hacks and free Robux, impersonating Facebook to encourage clicks on a malicious URL. The embedded URL, http://netcdn.tw/app/431946152/how-to-get-robux-for-free-2021-game-hack, is identified as a malicious redirector. The document's structure and content strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.tw/app/431946152/how-to-get-robux-for-free-2021-game-hack.
  • 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-robux-for-free-2021-game-hack In PDF document text
    • https://elearning.mtsn2bogor.web.id/__statics/gudangsoal/files/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn2bogor.web.id/__statics/gudangsoal/files/free-robux-hack-give-pass_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2bogor.web.id/__statics/gudangsoal/files/my-roblox-account-was-hacked-they-spent-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2bogor.web.id/__statics/gudangsoal/files/free-exploits-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2bogor.web.id/__statics/gudangsoal/files/free-roblox-outfits-for-boys_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2bogor.web.id/__statics/gudangsoal/files/coin-master-free-spin-app-apk_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn2bogor.web.id/__statics/gudangsoal/files/comment-etre-hacker-sur-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2bogor.web.id/__statics/gudangsoal/files/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn2bogor.web.id/__statics/gudangsoal/files/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn2bogor.web.id/__statics/gudangsoal/files/free-robux-generator-for-xbox-one_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2bogor.web.id/__statics/gudangsoal/files/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn2bogor.web.id/__statics/gudangsoal/files/coin-master-free-redeem-code_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn2bogor.web.id/__statics/gudangsoal/files/hacks-for-roblox-2021-june_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2bogor.web.id/__statics/gudangsoal/files/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2bogor.web.id/__statics/gudangsoal/files/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn2bogor.web.id/__statics/gudangsoal/files/free-minecraft-skins-pe_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn2bogor.web.id/__statics/gudangsoal/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2bogor.web.id/__statics/gudangsoal/files/robux-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2bogor.web.id/__statics/gudangsoal/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2bogor.web.id/__statics/gudangsoal/files/rixty-codes-free-robux_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_off0000313e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x313E 22944 bytes
SHA-256: d9f6704d837de18a146aa31613700a7faf67f37680c544e10334c630fc5ff6b0
font_01_sfnt_off000064d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64D2 19384 bytes
SHA-256: de28a66561f48ef455a7e74c3d38ef737581a70ecb9f32033b07134a01356d69

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