Malicious PDF — malware analysis report

Static analysis result for SHA-256 34cfd88447da4e8b…

MALICIOUS

PDF

35.2 KB Created: 2021-07-07 14:14:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 747731631f399383cd08aa831d82a910 SHA-1: 42975c3e1047c2a48771a5e2384b94f5fb903845 SHA-256: 34cfd88447da4e8b136cb17d445db764c74f280f0f0ebae3ccfc12a48beaccc4
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into clicking on what appear to be game hacks or generators. These links redirect to malicious infrastructure, specifically the URL http://netcdn.tw/app/431946152/roblox-piano-hack-game-hack. The document also contains numerous links to PDF files hosted on elearning.mtsn1bandarlampung.sch.id, suggesting a link farm for SEO manipulation or to host further lures. No scripts were extracted, but the primary attack pattern involves social engineering through deceptive links.

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.
  • 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.
  • 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/roblox-piano-hack-game-hack In PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/coin-master-free-snacks-link_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/free-robux-no-password-no-survey_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/roblox-how-to-get-free-hats-on-roblox-high-school_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/roblox-how-to-get-the-sqaure-body-for-free_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/google-play-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/wizard-hacks_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/free-roblox-treasure-hunt-app_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/fun-flex-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/sb-game-hacker-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/aristois-minecraft-hack_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/ro-ghoul-script_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/static-moonactive-net-rewards-2021_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_off00003365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3365 22264 bytes
SHA-256: 38ee1e01010535eb750d0b482c9ae716cfa10909dd145471e9f40be94f36a8cd
font_01_sfnt_off000064ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64EC 18932 bytes
SHA-256: bea12f5c1905fe5d1ca5acd369b45985eddae9fbbbe34fc32947a46404ebe472

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