Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24f42799d3f1de2…

MALICIOUS

PDF

44.3 KB Created: 2021-06-03 15:21:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: de5f572ca57913c2ffae376d206efa8a SHA-1: 2bab498c0b606819344eeedaf0b2b4ae2b591e66 SHA-256: a24f42799d3f1de28a8c985c4c7f59174e332b48f9ec60871c3ed3265acec005
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting game hacks and generators. The ML classifier strongly indicates maliciousness, and the presence of multiple redirector links suggests a phishing or scam attempt. Although no scripts were directly extracted, the PDF structure itself facilitates the redirection, likely leading to a further exploit or download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • 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.
  • 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.online/app/406889139/coin-master-spin-ml-link-game-hack In PDF document text
    • https://www.jcn.co.uk/uploads/files/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-spin-rewards_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/minecraft-games-free-to-play-online_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/roblox-hack-game_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-do-i-earn-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-youtube_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/minecraft-pe-free-download-android_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-without-human-verification-2021_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_004_off0000509e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x509E 24056 bytes
SHA-256: dd90d9f134a483c1de0235b200286902eac24e56023e8697dc1aae3e25d94f70
font_01_sfnt_off000087a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87A5 19220 bytes
SHA-256: e15cddb0e51480bf033bb4f5ccb54854b9814871c9f98b4157bc21f96693b00b

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