Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5ea4c222176a42…

MALICIOUS

PDF

44.8 KB Created: 2021-06-03 23:51:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0f80a1293fc0e3e0a5d8d46b15713cf0 SHA-1: 4ebde43eb1f531eb343e8d012bd1b379b9441c49 SHA-256: ef5ea4c222176a4228b33e33730c86b9515c03ee9b2fc5de915f688c508a140b
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as "game hacks" or "free generators". The document body and embedded URLs suggest a lure for free in-game currency or cheats, which is a common tactic for distributing malware or conducting phishing. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.online/app/406889139/coin-master-free-spons-apk-2021-game-hack In PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/how-to-change-your-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/pokemon-go-free-download-play-store_GM1094591345.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/wizard-hacks_GM479516143.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/pubg-uc-600-sri-lanka-price_GM1330123889.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/pokemon-go-free-download_GM1094591345.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/pokemon-go-free-install_GM1094591345.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/minecraft-for-laptop-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/can-pokemon-go-free-coins_GM1094591345.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/free-robux-group_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/roblox-free-robux-website_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_off000052eb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52EB 25828 bytes
SHA-256: ab53785a539d12fcd262444072a6f6c5db02fc937678dd6630497e77f2807e09
font_01_sfnt_off00008c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C19 18456 bytes
SHA-256: 29cdb33c079fef0813399b5d3456e0cee6bb382532089b205a8c189028fb290e

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