Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a11da23dd785e8f…

MALICIOUS

PDF

35.0 KB Created: 2021-07-04 12:54:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 33373f755a779531a91a74468b2f2919 SHA-1: fc7ed77be87d08144795c86b92ac90783257a019 SHA-256: 6a11da23dd785e8f6a2f88dd0698290b582583c3a909ea0d2a54a47276ded233
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to a known malicious redirector, masquerading as a generator for game currency or hacks. The primary link, http://netcdn.tw/app/406889139/get-free-cards-coin-master-game-hack, is identified as a malicious redirector. The document body, while containing garbled text, also includes this URL and other similar-looking URLs, reinforcing the lure. No scripts were extracted, but the heuristic firings strongly indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/get-free-cards-coin-master-game-hack In PDF document text
    • http://lib.stie-aub.ac.id/repository/toolbox-mod_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-roblox-hacks-pc_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-free-clothes-on-roblox-inspect_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-spin-link-for-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-generator-august-2021_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/transparent-roblox-shirt-template-free-shipping_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-spins-coin-master-links-thursday-november-28-2021_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-free-spins-link-2021-twitter_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-superhero-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-free-coins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-roblox-promo-codes-march-2021_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/progaming-hacks-com-roblox_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_002_off00003237.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3237 23104 bytes
SHA-256: 6c1994af1d1bfa46abb1d7c0fed363485e0c5decb8f88da71ea13b104acce8b8
font_01_sfnt_off0000665e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x665E 18172 bytes
SHA-256: ab80e3c1f88e3b8fd7e0672df70ead6a1706ea1e7c7a71db5d1bb16ff27d331b

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