Malicious PDF — malware analysis report

Static analysis result for SHA-256 20fe2721e47ec217…

MALICIOUS

PDF

33.0 KB Created: 2021-07-20 17:56:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 7bf7a9c5e9be4f455f0c16d745eff600 SHA-1: 3017127280e6f85c18ccd12864bc7cc18b8a6cdf SHA-256: 20fe2721e47ec217caeb501c52282b3a81ddb68f32f0463a820255fe690c9f46
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically advertising 'free generators' for games. The document body and embedded link annotations suggest a lure for free in-game currency or hacks, which is a common social engineering tactic. The primary malicious action observed is the redirection to a malicious URL, likely to host further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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/free-coins-and-spins-coin-master-game-hack In PDF document text
    • http://roberto-gac.org/images/free-robux-real_GM431946152.pdfIn PDF document text
    • http://roberto-gac.org/images/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://roberto-gac.org/images/free-views-tiktok_GM835599320.pdfIn PDF document text
    • http://roberto-gac.org/images/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdfIn PDF document text
    • http://roberto-gac.org/images/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://roberto-gac.org/images/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://roberto-gac.org/images/free-tiktok-likes-app_GM835599320.pdfIn PDF document text
    • http://roberto-gac.org/images/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • http://roberto-gac.org/images/free-modded-minecraft-server_GM479516143.pdfIn PDF document text
    • http://roberto-gac.org/images/minecraft-free-download-chromebook_GM479516143.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
stream_002_off00002ae9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2AE9 23276 bytes
SHA-256: 1b679c0e2fcb1348dfa56ee820efc8c36f2d296c062c4a4452e24c8dc30d33f6
font_01_sfnt_off00005fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAB 18060 bytes
SHA-256: f1068137021f01f6b5cc3550273fdf5362b49e27ffe305b66dd7920a08d48120

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