Malicious PDF — malware analysis report

Static analysis result for SHA-256 12dd9c197effe98f…

MALICIOUS

PDF

36.4 KB Created: 2021-07-22 03:30:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 71a8f772acce592a7029e758afc77bcf SHA-1: 36e99dc6fd0eaa5ff8e698135b01c43e0a4b3d11 SHA-256: 12dd9c197effe98f8886ae815d6fdf90a37e32e64d8028e0b18f38072d57d7e1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a redirector hosted at 'netcdn.tw', which is flagged as malicious. The document body and embedded links suggest a lure for game hacks or free items, a common social engineering tactic. While no scripts were explicitly extracted, the PDF structure and malicious links indicate an attempt to redirect the user to potentially harmful content, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9216

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/406889139/coin-master-free-game-hack In PDF document text
    • https://elearning.mtsn2tala.sch.id/__statics/gudangsoal/files/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2tala.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn2tala.sch.id/__statics/gudangsoal/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2tala.sch.id/__statics/gudangsoal/files/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn2tala.sch.id/__statics/gudangsoal/files/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • https://www.elearning.mtsn2tala.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2tala.sch.id/__statics/gudangsoal/files/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn2tala.sch.id/__statics/gudangsoal/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2tala.sch.id/__statics/gudangsoal/files/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn2tala.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EC0 23468 bytes
SHA-256: 4191b9f4082a503e85eb0a9a55e8dcf7334292c41eb99331625b4de3a0612738
font_01_sfnt_off000063eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63EB 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off00006dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD1 17712 bytes
SHA-256: 0afd6f2792edb83b7f2a0201a1e0a5eb12ca81ad868fb3e42742340ee6e5fb0e

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