Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e749f154fd4117…

MALICIOUS

PDF

44.5 KB Created: 2021-06-09 12:27:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 09b86ad61f69a4a92823c326dd5fe816 SHA-1: aafe9ce0e2fb6d18a2facb7f96c2f7e155df800f SHA-256: a8e749f154fd4117561d7e0df12e518d428b80daa84d7e3830f0d65d3cdbf98b
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 0.9865

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.tw/app/431946152/hack-indir-roblox-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.tw/app/431946152/hack-indir-roblox-game-hack PDF link annotation
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/completed-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/coin-master-game-hack-version-download_GM406889139.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/coin-master-game-hack_GM406889139.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/coin-master-free-spins-app-android_GM406889139.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/free-robux-real_GM431946152.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/how-to-get-free-clothes-on-roblox-2021-no-bc_GM431946152.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/roblox-exploit-scripts_GM431946152.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/roblox-free-items_GM431946152.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/how-often-pubg-uc-reviewed_GM1330123889.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/pokemon-go-free-shiny-celebi_GM1094591345.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/free-minecraft-premium-account_GM479516143.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/hack-coin-master-apk-32_GM406889139.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/grabpoints-robux_GM431946152.pdfIn PDF document text
    • https://www.roblox.coIn 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_004_off000052d2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52D2 24952 bytes
SHA-256: 9cc36479fdbe5dc0d24758a75be6f9db7467e767b80bed4e6b856da785bbcb2e
font_01_sfnt_off00008aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA3 18476 bytes
SHA-256: fd00d33e84d0de8737f5566889b4b5ee11e7a622515470c07a274ca1416b355a

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