Malicious PDF — malware analysis report

Static analysis result for SHA-256 5403d58637ff1523…

MALICIOUS

PDF

35.1 KB Created: 2021-07-05 15:01:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f46dd098a68b97dfbffcf881b9b72d52 SHA-1: 7b17b9527aabddb3e9b6af2f76a1ddbebcf9bcd6 SHA-256: 5403d58637ff1523c482d72f2af5106afb9900eff7264a9615910183a3f0c64e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector, http://netcdn.tw/app/406889139/coin-master-gifts-game-hack. This link is presented as a lure for a "game hack" and is likely intended to lead users to a malicious site or download. The presence of numerous other links related to free game currency and hacks further supports this phishing or scam attempt. No scripts were extracted, but the document's structure and embedded links indicate a social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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-gifts-game-hack In PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-robux-for-free-without-human-verication_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/robux-app_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-server-hack_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/how-to-get-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-ps4-download-free_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-site_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-free-coins-cheat_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-mods-for-coin-master_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-traversed-wall-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-bring-ak-to-roblox-school-hack_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/roblox-avatar-girl_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-free-gamepasses-on-roblox_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-no-human-verification-or-survey_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_off00003635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3635 22392 bytes
SHA-256: 9fe9b51d579f56b1a24fa8aa4c49daa2b7fceaa5ec58eb7e5c01ae82ade503ab
font_01_sfnt_off000067d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67D5 17836 bytes
SHA-256: 2b518dfcd0fe0609680a2236c1af8ab2eef27abcf2a8f037ef6c766c284a6818

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