Malicious PDF — malware analysis report

Static analysis result for SHA-256 89983a017c38c5cb…

MALICIOUS

PDF

35.5 KB Created: 2021-07-21 03:02:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7be23f2e5fd169d0128b714357a24864 SHA-1: c763e91390d607fc5f5e93f798d3e52d32809680 SHA-256: 89983a017c38c5cb1aa3fe469166e3aab99bb88741a20c50b46ae0f52c353583
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising "free generator / game hack" lures. The document body and embedded artifacts suggest a social engineering attempt to trick users into visiting these malicious URLs. While no scripts were directly extracted, the PDF structure and heuristic firings indicate a malicious redirector workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9251

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-for-coin-master-game-hack In PDF document text
    • https://art-concept.gr/images/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • https://art-concept.gr/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://art-concept.gr/images/free-tiktok-followers-app_GM835599320.pdfIn PDF document text
    • https://art-concept.gr/images/free-robux-offers_GM431946152.pdfIn PDF document text
    • https://art-concept.gr/images/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://art-concept.gr/images/free-minecraft-worlds_GM479516143.pdfIn PDF document text
    • https://art-concept.gr/images/how-to-download-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • https://art-concept.gr/images/free-minecraft-skin-packs_GM479516143.pdfIn PDF document text
    • https://art-concept.gr/images/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://art-concept.gr/images/roblox-hack-tool_GM431946152.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
stream_002_off00002b7b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2B7B 23652 bytes
SHA-256: fe0e2c4ab733d9892ed88ecf7ebbf201f5118602d78ce6c405ca2b73c49ae591
font_01_sfnt_off000060b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60B9 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off00006a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A58 17712 bytes
SHA-256: fd51fa1b849cf95139b510f282bcd47e41e352499df1938c7ca947a320e7b070