Malicious PDF — malware analysis report

Static analysis result for SHA-256 941ff60aa579c3bc…

MALICIOUS

PDF

34.0 KB Created: 2021-07-03 17:28:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8dad754a88464b6c91fc5476037fea51 SHA-1: 55c82ab9e95dae3957bcbc38930192cb586a3412 SHA-256: 941ff60aa579c3bc0807cbf1ac9480ef5ad1ade677a23ab36833a5c794a8a1b5
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'game hacks' and 'free spins' for popular mobile games. The document body and heuristics indicate a lure to trick users into clicking these links, which likely leads to further malicious content or malware downloads. No scripts were extracted, but the embedded URLs and the nature of the lure strongly suggest a phishing or social engineering attack.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/how-to-send-free-spins-on-coin-master-game-hack In PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-get-roblox-money_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-spins-link-31-march-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-hack-2021-without-verification_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-robux-group_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-mr-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-roblox-password-and-username_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robuxs-no-human-vefication_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-bonus_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/freespinandcoin_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/cheats-for-murder-mystery-2-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/easy-roblox-today_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/hack-someone-on-roblox_GM431946152.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_off00002ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DDB 23132 bytes
SHA-256: 9f8b6fa8095d69930c74706889b8d4d8f459ee20a7dbabe4d9d9920a84a331a2
font_01_sfnt_off000061a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61A3 18512 bytes
SHA-256: d1cbb3129a910aeedd4cd76ee28c1c86387a15fa69f74c6599f9f835bc102733

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