Malicious PDF — malware analysis report

Static analysis result for SHA-256 908ab1c98d10a371…

MALICIOUS

PDF

46.4 KB Created: 2021-05-11 05:36:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ad066fa2aff8a9c5f582534045c1540a SHA-1: 5426b845c163030195c76456bfe9c7f6ee3b2384 SHA-256: 908ab1c98d10a3718f9ec608b8196c9f86cc5dc02fe3701f485122fce57295dd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'game hacks' and 'free generators' for popular games. The primary lure URL is https://netcdn.xyz/app/406889139/free-appsfor-coin-master-daily-rewards-game-hack, which is associated with malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering attack aimed at tricking users into downloading further malware or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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.xyz/app/406889139/free-appsfor-coin-master-daily-rewards-game-hack In PDF document text
    • http://skwolcott.com/images/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • http://skwolcott.com/images/is-free-robux-real_GM431946152.pdfIn PDF document text
    • http://skwolcott.com/images/coin-master-hack-online-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • http://skwolcott.com/images/free-spins-for-coin-master-on-1-19-19_GM406889139.pdfIn PDF document text
    • http://skwolcott.com/images/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • http://skwolcott.com/images/free-coin-master-cards-link_GM406889139.pdfIn PDF document text
    • http://skwolcott.com/images/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://skwolcott.com/images/how-to-get-free-unlimited-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://skwolcott.com/images/free-100-robux_GM431946152.pdfIn PDF document text
    • http://skwolcott.com/images/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://skwolcott.com/images/roblox-executor-free-download_GM431946152.pdfIn PDF document text
    • http://skwolcott.com/images/minecraft-free-exe_GM479516143.pdfIn PDF document text
    • http://skwolcott.com/images/how-to-get-free-clothes-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://skwolcott.com/images/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://skwolcott.com/images/coin-master-free-spins--spins_GM406889139.pdfIn PDF document text
    • http://skwolcott.com/images/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://skwolcott.com/images/coin-master-hack-lost-world-2021-com_GM406889139.pdfIn PDF document text
    • http://skwolcott.com/images/earn-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://skwolcott.com/images/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://skwolcott.com/images/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b82.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B82 25356 bytes
SHA-256: 01b8953a1f76403874c0baef5dfe4b35423f90bc0936a2e7608c4abe7705f504
font_01_sfnt_off0000868a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x868A 3460 bytes
SHA-256: 582708023ba280d4d50e04d3196ed4a98a24323596270ce5a55f31618faa5208
font_02_sfnt_off000091f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91F7 18648 bytes
SHA-256: 71ac04cffa71c9bf594e3caaf5f74bb84b218965b92dd7062f0876fd9732766f

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