Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e763a052f7cd26…

MALICIOUS

PDF

46.1 KB Created: 2021-05-11 08:02:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 395c5e88df03b4d6efa4d4c20cd46a85 SHA-1: ac4fed7e2ef5c9789fc71bb154e466c03fba5970 SHA-256: 42e763a052f7cd26c3a6afe2fd85e7c9ab02010526c3353fb9560cd21330c82b
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 0.9980

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/431946152/how-to-get-free-robux-without-paying-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/431946152/how-to-get-free-robux-without-paying-game-hack PDF link annotation
    • http://www.myresidence.lu/userfiles/files/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/coin-master-hack-download-ios_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/como-descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/mc-update_GM479516143.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/best-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/free-robux-download_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/hack-para-coin-master-sin-verification_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/coin-master-fan-page-giveaway_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/roblox-robux_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/daily-coin-master_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/how-to-get-roebucks-on-roblox_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
stream_003_off00004992.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4992 30500 bytes
SHA-256: e4443127d824c887d42ffa4d54581dd90916d2228ab63b98386b5a28ff54109a
font_01_sfnt_off00008e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E47 19616 bytes
SHA-256: cf429e2e91354d73b6f0728fc312d6ff4bad20be80a5ba6db32adcb01c969c4a

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