Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc36c67392808974…

MALICIOUS

PDF

35.8 KB Created: 2021-07-04 08:23:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c10e9073d8326eb21b1bad35a6ddecf5 SHA-1: bb13e343370a3dd4810aeea32116fc3cb37774a1 SHA-256: fc36c673928089740d0b59a8c085b49cf75205494026dcbf95bd9f528571a785
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, employing tactics like 'free generator' and 'game hack' themes to entice users. It contains numerous links to external PDFs and a primary redirector URL, indicating a phishing or scam attempt. The ML classifier strongly supports the malicious nature of this document, and the presence of embedded URLs suggests an attempt to drive users to malicious infrastructure.

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/431946152/free-robux-generator-no-verification-2021-game-hack In PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/free-robux-gui_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/how-to-get-free-purple-hair-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/coin-master-hack-quora_GM406889139.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/how-to-hack-into-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/www-roblox-cheat-us-limited_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/free-minecraft-skins-ps4_GM479516143.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/how-to-hack-coin-master-with-game-guardian_GM406889139.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/minecraft-free-download-mac_GM479516143.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/8bp-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/hack-roblox-games2021_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/hack-para-volar-en-roblox_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/how-to-get-free-25-robux_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/free-coins-on-coin-master-generator_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_off00003422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3422 22168 bytes
SHA-256: a7fb409fb540782ae53c529e5daebe8b188d7c37c58fab7841d2fbe73621ca19
font_01_sfnt_off0000658b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x658B 19476 bytes
SHA-256: 422264a0cdeadcdb3e2ce6070f5cb4f9bd6f0b6f51af0cd9a99234ab5f0c0b46