Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd74b810dfaf2d58…

MALICIOUS

PDF

31.0 KB Created: 2021-07-19 15:13:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2b3df42df2a290e3fbc881ed075d9b51 SHA-1: 8f7f25ce2a23ff0dda9b4b9645d8b916bd154879 SHA-256: bd74b810dfaf2d58434f86b4f5060eebdd5cea785cc3a7983a96cc6063b6a9da
160 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically targeting users with a lure for free game hacks. The document body and embedded URLs reinforce this by pointing to sites offering 'free generators' or 'free spins', ultimately leading to the malicious URL http://netcdn.tw/app/479516143/how-to-get-a-free-minecraft-server-game-hack. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest it is designed to exploit user interest in free in-game items to redirect them to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9375

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-a-free-minecraft-server-game-hack In PDF document text
    • https://elearning.mtsn1balangan.sch.id/__statics/gudangsoal/files/minecraft-free-android_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn1balangan.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1balangan.sch.id/__statics/gudangsoal/files/make-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1balangan.sch.id/__statics/gudangsoal/files/how-to-earn-free-robux_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_off00002652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2652 22468 bytes
SHA-256: 9863ea2fccb9fb62f2d5d98fd96cb97b5f1e304fe5d1115b2ba5ed15245e636a
font_01_sfnt_off00005854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5854 17988 bytes
SHA-256: 888c9dccd83fb0c13f9447925305c3d56d9429efcbe621f5ab8e9b5d24de1b14

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