Malicious PDF — malware analysis report

Static analysis result for SHA-256 925875ceb12809fb…

MALICIOUS

PDF

35.7 KB Created: 2021-07-06 20:47:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 61de31cb3886549bc42edab7138df280 SHA-1: 188d91d1f91674d98371f963e4892b6b43b1ee74 SHA-256: 925875ceb12809fb567773617c61defafe0d6d17e5a4990779412df4877b5728
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users into clicking on what appear to be game-related cheats or generators. The primary link redirects to malicious infrastructure, and the document body contains a large number of SEO-optimized links pointing to other PDFs, likely part of a link farm. No scripts were extracted, but the presence of malicious redirectors and the lure content strongly suggest a phishing or scamming attempt.

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-2021-free-spins-link-blogspot-game-hack In PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/want-free-robux-copy-and-paste_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-vip-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-instant-no-lie-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/how-to-get-free-robux-on-a-samsung-tablet_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-cheat-free_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/hack-coin-master-nyc_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/bloxwin-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/roblox-how-to-hack-the-catalog_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-roblox-exploit-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-heaven-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-hack-free-spins_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/best-free-script-executor-roblox-2021-march_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/speed-hacks-roblox-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/how-to-hack-server-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/can-i-change-back-to-old-roblox-name-for-free_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/hack-roblox-a-telecharger-gratuit_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/speed-hack-roblox-cheat-engine-63_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/cheating-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-codes-for-roblox-clothes_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/how-to-hack-date-of-account-created-on-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_off000031e4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31E4 23372 bytes
SHA-256: 4d2dcce3ef7d5e9e864a158a67717201fd3219dda7cd0c8650bc81dc906dcbf6
font_01_sfnt_off00006697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6697 19036 bytes
SHA-256: 19b793172c3e4e67372f0948662efcb12590f1ebd1aedebdca9f554a15f0a298

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