Malicious PDF — malware analysis report

Static analysis result for SHA-256 15adcee4d91f9799…

MALICIOUS

PDF

42.4 KB Created: 2021-05-12 07:52:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 33096c75a7302c69a834de3bd3707fa1 SHA-1: 69dc923e039e1be5196a16b6092a91750bf84f35 SHA-256: 15adcee4d91f9799616cd064993dad35911233e64546c4bc5485a88d2077ad8d
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external sites, many of which are disguised as game hack generators or free currency offers, impersonating brands like Facebook. This strongly suggests a credential phishing or malware distribution scheme. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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: https://netcdn.xyz/app/406889139/cm-free-spins-and-coins-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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.xyz/app/406889139/cm-free-spins-and-coins-game-hack PDF link annotation
    • http://ratchadatitan.com/UserFiles/File/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/coin-master-attack-madness-hack_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/coin-master-hack-2021-download_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/coin-master-daily-bonus-hack_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/minecraft-free-download-2021_GM479516143.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/coin-master-pc-hack-download_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/free-coins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/coin-master-fb-free-spins-link_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/minecraft-hacks-115-2_GM479516143.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/roblox-rewards-site_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/free-google-play-promo-codes-coin-master_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
stream_003_off00004b58.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B58 25188 bytes
SHA-256: 36bbb57090f1f5da7c23e94c947ff3a7e71cc4dbaf53f1d1b977e0d9be0e6cf4
font_01_sfnt_off00008494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8494 17988 bytes
SHA-256: 6c27acc7e1a27f4dd98d9cdf7a00649578deada87f4d5bf77ad692372392325d

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