Malicious PDF — malware analysis report

Static analysis result for SHA-256 43620106b176019b…

MALICIOUS

PDF

35.1 KB Created: 2021-07-05 05:08:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 8742ed31cc212f682366b7e9b9b86063 SHA-1: fd035cf70a587ea13c793efc2ced3f777fe4ea05 SHA-256: 43620106b176019bc484aa8f1dce6d95e4bbbac82be5901be74ad7672e28f9f2
220 Risk Score

Malware Insights

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

This PDF document employs a lure of game hacks and free currency to trick users into clicking malicious links. It contains numerous links to redirectors and SEO link farms, including http://netcdn.tw/app/406889139/coin-master-hack-mod-apk-2021-download-game-hack, which is flagged as a known malicious redirector. The document's structure and content suggest it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 http://netcdn.tw/app/406889139/coin-master-hack-mod-apk-2021-download-game-hack In PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-apk-mod-free-download_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/pubg-uc-shop_GM1330123889.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-get-free-money-on-adopt-me-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/martian-lettuce-coin-master-free_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-detects-cheat-engine_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-get-free-robux-insert_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/android-1-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-city-simulator-free_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-free-usernames-and-passwords-wolfkami23_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/best-free-thumbnail-maker-for-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-catalog-stuff-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-hack-tool-download_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-hack-that-actually-works_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-download-nonsense-diamond-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-hack-someones-roblox-account-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
font_00_sfnt_off0000324f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x324F 22284 bytes
SHA-256: 723aa5df381a6f8fca7cfa54170469afe739f19111660ca6b5380a85b929b96a
font_01_sfnt_off000063d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63D6 19160 bytes
SHA-256: 2e0c8884db6cd57ed43f8d315a9bbff67e391c14a9a376a83d1d8791999d1529

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