Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2001acbcc9564ce…

MALICIOUS

PDF

34.5 KB Created: 2021-07-06 08:35:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 9cb187f6e4a366a96414f761a2e04ca4 SHA-1: ed94189b9711c74c97b95fd0f9cab6f9656ea0c5 SHA-256: e2001acbcc9564ce59eafe499b6069a49028d9369274ce31ee46d56a0ed5de00
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple heuristics indicating a malicious redirector and brand impersonation for credential phishing. The embedded URL http://netcdn.tw/app/406889139/how-to-get-free-coins-on-coin-master-iphone-game-hack is identified as a malicious redirector and a lure for game hacks. The document body, though partially garbled, contains references to this URL and other similar lures, reinforcing the phishing and redirection intent. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.tw/app/406889139/how-to-get-free-coins-on-coin-master-iphone-game-hack.
  • 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-get-free-coins-on-coin-master-iphone-game-hack In PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-final-stand-hack_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/can-you-get-robux-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/generator-get-free-robux-denisdaily_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-spin-hack-link_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/robux-best_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/f3x-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/sex-hack-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/sword-fighting-roblox-game-free-to-copy_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/working-hacks-for-getting-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-change-your-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-roblox-admin-accounts_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-com_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-game-passes-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-spin-coin-master-game_GM406889139.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_off00002fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FB0 23196 bytes
SHA-256: d226ea5a475ccd4f9b45a550eaf6c98efa70fd948f3adeb060ad424da1f5d0ea
font_01_sfnt_off000063d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63D0 18504 bytes
SHA-256: 395fc550c26729eff2306150ae31713d8bd4c4ff218e2b94d4b8ad057d21bb45

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