Malicious PDF — malware analysis report

Static analysis result for SHA-256 99da92bf42dfd04b…

MALICIOUS

PDF

35.5 KB Created: 2021-06-25 15:20:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 4f35fefbea6d214bb4b3b366c0708417 SHA-1: 09f9b2f3cde89d82bc12e73bbc56dc1bc1a0f354 SHA-256: 99da92bf42dfd04be5fb63a296b2b1923a9b33d6dda14c614c2066d460677636
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple embedded links, including one pointing to a known malicious redirector infrastructure at http://netcdn.co/app/431946152/free-robux-no-verificationor-offer-game-hack. The document body and heuristics indicate a lure for free in-game currency or hacks, a common tactic for phishing or malware distribution. No scripts were extracted, but the presence of malicious links and the lure suggest the document is intended to lead the user to a malicious site.

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.co/app/431946152/free-robux-no-verificationor-offer-game-hack In PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/free-robux-obby_GM431946152.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/make-free-robux_GM431946152.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/pokemon-go-free-643_GM1094591345.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/free-game-packs-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/free-minecraft-coins_GM479516143.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/free-coins-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/free-robux-please_GM431946152.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/free-tiktok-app_GM835599320.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/coin-master-spin-hack-no-verification_GM406889139.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/coin-master-free-spins-link-quora_GM406889139.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/roblox-play-now-for-free_GM431946152.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/coin-master-hack-mod-game-download_GM406889139.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
font_00_sfnt_off0000331c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x331C 22528 bytes
SHA-256: 352bd3d1ef3b552e63f13f9a0c98370fb8db95b01efb8d1060aba8f1884ae5ea
font_01_sfnt_off000065a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65A1 19072 bytes
SHA-256: 06ad228c5397f7579b095543b790e73d9b27a09f6c27f16bb46ef61b621de0cf

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