Malicious PDF — malware analysis report

Static analysis result for SHA-256 401c7cfdf11b7328…

MALICIOUS

PDF

57.3 KB Created: 2021-06-03 21:04:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4ddb00d5e7e63ac049203d0acfcf1863 SHA-1: ff6799574506aa69c8ecac6bbc40a4fe255f6065 SHA-256: 401c7cfdf11b73282d063de704f5fdacd2362812f5624c81536367da77b4f1a1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to websites offering 'free generators' or 'hacks' for popular games, such as Coin Master and Robux. These links are flagged as malicious redirectors, indicating a likely attempt to lure users to potentially harmful sites. The document body and embedded URLs strongly suggest a social engineering tactic to drive traffic to these redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9684

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 https://netcdn.online/app/406889139/coin-master-link-daily-get-free-spins-and-coins-game-hack In PDF document text
    • http://library.stieyapan.ac.id//repository/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/rbx-claim_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-pe_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-download_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-do-you-get-free-roebucks_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-hack-tool-apk-download_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-on-facebook_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/doctor-louie-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/worst-roblox-avatars_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-card-link-today_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-coin-master-s_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coinmasterfreespinlink_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-get-unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005111.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5111 26988 bytes
SHA-256: 778bf2bebad3a22fae4451795fb591d5fc1c368603b47a7d3e343bd8487945bf
font_01_sfnt_off00008f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F7C 3088 bytes
SHA-256: 21947db80f63681192ff4d23c9293372afcdd8455d0079c5ca62ec2c2320d79e
font_02_sfnt_off00009a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A47 7960 bytes
SHA-256: cf7ae5cf6bef3222f5a26bec705b492fed0278aec6b16ec101aeda46e0edd2b2
font_03_sfnt_off0000ad6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD6D 18652 bytes
SHA-256: 0bf586afe4d5f3c7a2e6d5ddfec06764aa84fbd58834f3b0eff460c3a87010f1
font_04_sfnt_off0000d099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD099 4272 bytes
SHA-256: fac9a06ceb5574feb8580c075df3ef69dfbd0efa4947186cfe90f11b68eaafb0

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