Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6fa363ddd15af0…

MALICIOUS

PDF

43.3 KB Created: 2021-06-03 23:16:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ef27eb1d7ce6b790259505cf5d983df6 SHA-1: 0b26784df4c80d76ab66a79e0a6077e26b67f8b2 SHA-256: ef6fa363ddd15af056d3ea309f2983b11e92af8eedb71c4f8fac6398bef1e87a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free generator / game hack' content. The document body, though partially corrupted, also contains URLs that appear to be lures for game-related cheats or downloads. The primary goal is to redirect the user to potentially malicious content hosted on external sites.

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/1094591345/pokemon-go-free-box-march-2021-game-hack In PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/coin-master-game-for-pc-free-download_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/free-spin-coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/minecraft-116-apk-download_GM479516143.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/coin-master-fan-page-facebook_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/can-i-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/roblox-robux-generator_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/free-attacks-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/free-pet-food-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/download-hacked-games-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/mcpe-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/free-tiktok-fans-no-verification_GM835599320.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/free-robux-download_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.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_off00004f23.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F23 23572 bytes
SHA-256: f146aa6b7f672b913e11cf496622334e33167684cfba68c602963a805e3b464d
font_01_sfnt_off00008451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8451 19064 bytes
SHA-256: 04a6495b5013b087c57e7a0d9491a1185b7479aabc484fa1b72cfbb114032511

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