Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25947d3fad391e9…

MALICIOUS

PDF

45.9 KB Created: 2021-06-09 03:52:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9e2e7eb8bec85e62c9b51c33557fd2e4 SHA-1: 6a3a3c513c0e127a2b503b735c63a4ffa7ba537e SHA-256: a25947d3fad391e99b35ee9853d894e802549088a3e001c3bc22c0ef1c22867f
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into downloading game hacks or generators, redirecting to malicious infrastructure. The heuristic firings indicate a malicious redirector and a link farm, suggesting the primary goal is to drive traffic to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.
  • 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.
  • 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 https://netcdn.tw/app/431946152/synapse-roblox-download-free-game-hack In PDF document text
    • https://diendientuvn.com/public/upload/files/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/coin-master-hack-ios-apk_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/free-roblox-like-botsw_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/coin-master-free-card-link-today_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/roblox-scripts-cheats-2021_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/fake-robux-codes_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/how-to-get-free-admin-in-roblox_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/free-roblox-girl-hair-not-a-model_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/coin-master-spin-link-free-download_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/minecraft-java-edition-for-free_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
stream_004_off00005242.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5242 25676 bytes
SHA-256: 501a1483eb878a57d2f7da677cc2082a13211dba1d5ba0a2502287b9041183d4
font_01_sfnt_off00008e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E47 19036 bytes
SHA-256: 768bd3a9a8bea0ba792fb255663fc560627fa474c7e6c88717cd7da875795cab

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