Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d9289f180d2be9…

MALICIOUS

PDF

44.5 KB Created: 2021-05-15 09:57:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e2c62cfcce786f393d738ab21912a593 SHA-1: dc2b32839c81e5e3f2823d6c5135f43569250542 SHA-256: a8d9289f180d2be99a9048f40e9bf42589097fe5a384a76d8aef51c648550671
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites that promise game hacks and free in-game currency, a common lure for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a malicious intent to redirect users to potentially harmful sites. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

Heuristics 5

  • 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.
  • 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/haktuts-coin-master-free-spin-link-game-hack PDF link annotation
    • https://www.croydex.com/uploads/files/files/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/minecraft-com-free_GM479516143.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/ac-market-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-robux-wheel_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/instagram-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/mcpe-hack-client_GM479516143.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-links-coin-master_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/hackear-coin-master-sin-verificacion_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-hack-someones-minecraft-account_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a8a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A8A 24184 bytes
SHA-256: faaa91636ae367360f39b7b47f10336a91db6585dd5aaeabb0680425940e5c0a
font_01_sfnt_off000081fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81FA 2868 bytes
SHA-256: d2d857e2ddc1082c7667b23f2135a5c0ba26a2ff8b42c86c89c8e0b09aece855
font_02_sfnt_off00008be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BE4 18196 bytes
SHA-256: d21f7c9777ff22c572caba6bc61bff535e054503ba9d308437b2513133ac2854

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