Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5dc1fc4755313c…

MALICIOUS

PDF

44.3 KB Created: 2021-06-04 03:22:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 032a4ce8fcc93fa114a13ce3fbfdd1ce SHA-1: d21fda69fd31788be0e443a72acc29df24c01cc4 SHA-256: 0f5dc1fc4755313ca3fb04f739efb54881d60a0e8a9ab1934f281948ed248bb4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a redirector URL, which is a common lure for game hacks and free currency. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, likely for further exploitation or phishing.

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/431946152/a-lot-of-robux-game-hack In PDF document text
    • http://perpus.i2s-learning.com/repository/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-roblox-animations_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-coin-master-gold-cards_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-spin-coin-master-new-link_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/minecraft-xbox-one-code-free_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/legit-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/roblox-free-models_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/robux-game-com_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-cracked-apk-free-download_GM406889139.pdfIn PDF document text
    • https://www.communes.comIn 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_off00004e50.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E50 26152 bytes
SHA-256: cf1a6f44f9bd745cec7705aa1665fbb4dee4568ff5a66017be6cc6de45669f21
font_01_sfnt_off00008b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B58 17952 bytes
SHA-256: 59ace597cf85b15723adf2883f87d3990bd92e723e57ffb30000155e26dd48af

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