Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5b2da26ea695a6…

MALICIOUS

PDF

49.7 KB Created: 2021-05-19 17:16:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 31044b6be8825cf045a008ca25d08dd5 SHA-1: 8bb0e8132f059f9d05bd391a90ee2e30cc15105a SHA-256: 5f5b2da26ea695a690268dd00cf5ee4ee2e99cd507374df02fd0788a208a62c2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free game currency, directing users to a URL associated with malicious redirector infrastructure. The document body and embedded links strongly suggest a phishing or scam attempt, likely intended to lead users to a malicious site or download further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8642

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.xyz/app/406889139/how-to-get-free-spins-on-coin-master-facebook-game-hack In PDF document text
    • http://heilzentrum-ulm.de/images/roblox-18_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/daily-free-spins_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/tiktok-for-free_GM835599320.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/pubg-uc-2021_GM1330123889.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-hack-online-without-human-verification_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/pokemon-go-free-items_GM1094591345.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-hack-download-ios_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-sued_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coinmaster-gps-user-review-coinmaster-coin-master-hack-pagedemo-index_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-can-i-get-free-coinsn-coin-master_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-real_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/hack-my-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049ab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49AB 24380 bytes
SHA-256: 7575198eb1fe2533bd2cd09a1645efc168b0646827c4c302e8b887c9eb5636ff
font_01_sfnt_off00008138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8138 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AE4 8676 bytes
SHA-256: e06aca5f85e50ae6cefda302c5299c18ab6d27c174f74f0bb0ee8efa7ccb4468
font_03_sfnt_off00009f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F6F 18380 bytes
SHA-256: 71bee5fb83ca58b21c1d24b393ac6a95aa3d07cb2aa8ee860216aa324e2c09d6

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