Malicious PDF — malware analysis report

Static analysis result for SHA-256 891a73a445d97b94…

MALICIOUS

PDF

31.9 KB Created: 2021-07-03 20:27:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 312ca60d9cdc764ac05f09437543b9d1 SHA-1: 77c9485601d3d9dac30abaa76f68bd468810a567 SHA-256: 891a73a445d97b94dd38b9e3efee6cb547f835f8e33dee86b4731a53fc1ad609
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains a prominent link to 'netcdn.tw' which is associated with game hacks and cheats, a common lure for malware distribution. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/coin-master-free-chip-game-hack In PDF document text
    • https://www.sonestad.se/library/repository/is-pubg-uc-hack-possible_GM1330123889.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-free-spins-link-today-ios_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/is-free-robux-real_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/minecraft-cheats-switch_GM479516143.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-hack-coins_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/hacks-for-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-paypal-accounts-with-money-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-100-spin_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/www-coin-master-hack-tk_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/roblox-cheating-real-no-more-playing_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/roblox-premium-free_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-ios-gods-hack_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/robux-sign_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-app-hacks_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000029b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29B5 21996 bytes
SHA-256: 766a0542b45dae344f9960b70788203a679a14c520794dc2b38734b7613a0a58
font_01_sfnt_off00005a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A3F 18340 bytes
SHA-256: 8ade81e28ce8b37bbf8c6334d153083f90bbf230f38b0c74cd71ceca923da60d

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