Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3af455273bd6db…

MALICIOUS

PDF

44.6 KB Created: 2021-06-10 14:57:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a0854ce03705ac3aec4c95df511df1d5 SHA-1: e45f1c4d4c6af7bfe58cdb96ca0034a929d540b5 SHA-256: ac3af455273bd6dbc96c6c7151eee99706b9391c831196a7f78f6cb6082e77e2
160 Risk Score

Malware Insights

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

The PDF contains multiple links to redirector domains, specifically advertising 'free generators' and 'game hacks' for popular games like Roblox and Coin Master. These links, such as 'https://netcdn.tw/app/431946152/easiest-money-hack-febuary-roblox-rocitizens-game-hack', are flagged as malicious and lead to further PDF documents hosted on 'perpus.i2s-learning.com'. This indicates a likely phishing or malware distribution campaign, potentially using the PDF as an initial lure.

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.tw/app/431946152/easiest-money-hack-febuary-roblox-rocitizens-game-hack In PDF document text
    • http://perpus.i2s-learning.com//repository/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-tricks-and-hacks_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/how-to-get-free-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/wurst-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-adopt-me-cheats-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-robux-picture_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/minecraft-hacker-mask_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-hacks-reddit_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-bloxburg-hack_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_off00004f3b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F3B 24972 bytes
SHA-256: 10376f38b9d5233640135fd4fc74834c64a4e5eba1793f1ef0e309e68daaf6a5
font_01_sfnt_off00008940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8940 19168 bytes
SHA-256: 0e60f247002b41488d9bcee11499ee81aed2ee22f49c20a46084908765a3443d

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