Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c2f55dab04ca479…

MALICIOUS

PDF

45.2 KB Created: 2021-06-03 06:33:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 3120f49fbf781afed8d12b9eda85c779 SHA-1: 94c823f0a67c8e5f0c1c0f7935d99975f7b80045 SHA-256: 9c2f55dab04ca479de7ddab192d853f38b06e59b789e8d0d5eaf5f16a24e2519
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links designed to lure users to external websites, masquerading as free Robux generators or game hacks. One primary link redirects to known malicious infrastructure, indicating a phishing or scam attempt. The document body, though partially corrupted, contains keywords related to these lures and the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.online/app/431946152/free-robux-redeem-codes-2021-game-hack In PDF document text
    • https://www.nara.org.uk/uploads/files/files/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/real-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/minecraft-mod-menu-apk_GM479516143.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-20-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-free-attack-link_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/master-coin-free-link_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/daily-coin-master-free-spin-link-facebook_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-hacks-no-downloading_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/javascript-free-robux_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/how-to-get-minecraft-for-free-on-xbox_GM479516143.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/stock-speed-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/how-to-get-free-cards-in-coin-master_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
stream_004_off000050bf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50BF 25744 bytes
SHA-256: 881a46dfcecf577a67ea170146b4b185d385c31d161565ae87fabe23d6d4b56e
font_01_sfnt_off00008c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C79 18852 bytes
SHA-256: 835008e062f354a08c5cd285c30dce0b291468b55589a8f36d5d300bab70ed7b

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