Malicious PDF — malware analysis report

Static analysis result for SHA-256 7979cc31c16cc112…

MALICIOUS

PDF

42.2 KB Created: 2021-05-10 15:33:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3fffc738155f24cea472aa68cf62dd4d SHA-1: 007dee52e2ec25856b004c001a5fd1a3d32bf400 SHA-256: 7979cc31c16cc112dd292bbc6c80eb0c2a24d3aaa749e9eba7ca9e982cce0d70
122 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 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 5

  • 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-hack-without-verification-code-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-hack-without-verification-code-game-hack PDF link annotation
    • http://cintabaca.org/katalog//repository/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-coin-spin-daily-link-coin-master_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-70-spin-link-2021_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-exploit-download_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-hack-spins-ios_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-free-outfits-on-roblox_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-coins-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/grabpoints-robux_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_off00004a80.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A80 24504 bytes
SHA-256: d275bb30e1b78a0396b632e5e0c9998b3ff0b72386fd9c8b223ade09274430e7
font_01_sfnt_off000081dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81DD 18528 bytes
SHA-256: 73698aa0d04f612b8edcfc98417ef0f8be184b3e572c91f5f0109cbf791ef469

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