Malicious PDF — malware analysis report

Static analysis result for SHA-256 d920a6e2f9a39359…

MALICIOUS

PDF

41.8 KB Created: 2021-05-14 02:37:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: cfbf98c4fdad6696802eeaafa282e3eb SHA-1: 6a1393903d950bfb371be4b3990d21e3ab5f89c5 SHA-256: d920a6e2f9a393590d4f67545414720520c4e964983ca1416eb7e39d363b29fe
182 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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/coin-master-ultra-attack-hack-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/coin-master-ultra-attack-hack-game-hack PDF link annotation
    • http://mypizzaoven.com/images/omplete-surveys-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://mypizzaoven.com/images/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • http://mypizzaoven.com/images/hack-coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • http://mypizzaoven.com/images/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://mypizzaoven.com/images/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://mypizzaoven.com/images/minecraft-ios-mods_GM479516143.pdfIn PDF document text
    • http://mypizzaoven.com/images/coin-master-free-card-link-today_GM406889139.pdfIn PDF document text
    • http://mypizzaoven.com/images/how-to-get-free-spins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://mypizzaoven.com/images/kachifpro_GM406889139.pdfIn PDF document text
    • http://mypizzaoven.com/images/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • http://mypizzaoven.com/images/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://mypizzaoven.com/images/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://mypizzaoven.com/images/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://mypizzaoven.com/images/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • http://mypizzaoven.com/images/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://mypizzaoven.com/images/pig-master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://mypizzaoven.com/images/extra-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://mypizzaoven.com/images/coin-master-free-spins-link-2021-twitter_GM406889139.pdfIn PDF document text
    • http://mypizzaoven.com/images/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://mypizzaoven.com/images/coin-master-free-spins-hack-without-human-verification_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_off000048a8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48A8 24964 bytes
SHA-256: a6c5a794a0685508379bdf5816f7cf637cc62e12acb726fc387cc1c5c2aa2a7e
font_01_sfnt_off000081eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81EB 17976 bytes
SHA-256: 1801f115f2963c0be987287eb476f8c8d71e26b2eb4f67ac20109eb32362552c

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