Malicious PDF — malware analysis report

Static analysis result for SHA-256 625a7aee10dbac9d…

MALICIOUS

PDF

34.3 KB Created: 2021-07-04 15:47:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 5a3d23267631608f5d78e191bf3638f8 SHA-1: 3dd99ecf88421e49721484cb6a52f8c71b0d7eba SHA-256: 625a7aee10dbac9d6c7a03056c76a0b6978bdbb45ec0428740d8c294a8834726
200 Risk Score

Malware Insights

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

The PDF document contains multiple links designed to lure users into clicking on them, impersonating brands like Facebook to solicit credentials or direct them to malicious sites. The primary link, http://netcdn.tw/app/431946152/how-to-get-free-robux-hack-game-hack, is identified as a malicious redirector. The document body and heuristics indicate a phishing or scam attempt related to game hacks and currency.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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: http://netcdn.tw/app/431946152/how-to-get-free-robux-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
  • 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 http://netcdn.tw/app/431946152/how-to-get-free-robux-hack-game-hack In PDF document text
    • http://astdubai.co/userfiles/files/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-robux-for-free-generator_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-daily-free-spins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-do-i-get-robux_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-apk-hack-35-8_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/links-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-tiktok-app_GM835599320.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/what-player-got-banned-for-using-free-models-roblox_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-20-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/pokemon-go-free-3d_GM1094591345.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/working-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/give-free-robux_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-spin-coin-master-online_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-hack-tool-pc_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-hacks-for-spins_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-get-minecraft-pe-for-free-ios_GM479516143.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
font_00_sfnt_off00002db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DB4 22848 bytes
SHA-256: 91b53c8747834235ca0973bbb45354c8ff6fdc2b2f28cbf631ae2682e55a186b
font_01_sfnt_off000060d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60D2 19152 bytes
SHA-256: a9bff55de90b7722e0be476df1c7a65da1171d9638b3b21a902752e59eae7e63

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