Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7c14a2305888d5…

MALICIOUS

PDF

35.0 KB Created: 2021-07-10 03:22:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c0c98c3398050c8e05ad54ad8cfd09fd SHA-1: b2c61e9c8b7ffeb4b60e0212111ffb2c93c25137 SHA-256: bc7c14a2305888d5948bfdcebb474baacf9ee0a65fabe94bf0e22e7d238ebf62
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains lures for free Robux and game hacks, directing users to external URLs. The ML classifier strongly indicated maliciousness, and the document body confirms the lure. While no scripts were extracted, the embedded URLs are the primary indicators of a phishing or scam attempt, likely leading to further malicious downloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/431946152/huskybuckscom-free-robux-game-hack PDF link annotation
    • https://weddingcards-expert.tw/upload/files/haktuts-coin-master-today_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/roblox-exploit-super-nice-mml-hacks_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/how-many-levels-does-coin-master-have_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/coin-master-update-2021_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/get-free-robux-website_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/where-can-i-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/pastebin-robux-hack-v6-5-mythical-chaos_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/how-to-get-22-000-free-robux_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/free-robux-no-email_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/account-passwort-roblox-hack_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/what-is-the-secret-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/coin-master-hack-version-download-2021-ios_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/free-download-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_002_off00003076.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3076 22516 bytes
SHA-256: 859134ac85507557718c8ad277175ee8a852f240984e8201b40f2f871b4fee2f
font_01_sfnt_off000062f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62F7 19324 bytes
SHA-256: fa71a02eff7d38361fd0194e941a22015f12e2817721f9ddba48d3de862e217b

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