Malicious PDF — malware analysis report

Static analysis result for SHA-256 198ffb2c99086220…

MALICIOUS

PDF

45.9 KB Created: 2021-06-13 21:45:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b228da761b03420c9afef6e3d74e48f4 SHA-1: 88378f3ba372a89b1adae521fd070e2e84b63a4d SHA-256: 198ffb2c99086220ba3acca87adfd9e09640f108b9d40bfe96abc244026b30a1
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/how-to-create-a-shirt-for-free-on-roblox-game-hack PDF link annotation
    • http://loriginedupain.org/images/roblox-guest-clothes-free_GM431946152.pdfIn PDF document text
    • http://loriginedupain.org/images/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
    • http://loriginedupain.org/images/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://loriginedupain.org/images/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://loriginedupain.org/images/how-to-get-free-tiktok-fans_GM835599320.pdfIn PDF document text
    • http://loriginedupain.org/images/toolbox-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://loriginedupain.org/images/how-to-get-free-robux-in-console_GM431946152.pdfIn PDF document text
    • http://loriginedupain.org/images/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://loriginedupain.org/images/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • http://loriginedupain.org/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://loriginedupain.org/images/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://loriginedupain.org/images/how-to-upload-music-to-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://loriginedupain.org/images/free-gold-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://loriginedupain.org/images/mc-hacks_GM479516143.pdfIn PDF document text
    • http://loriginedupain.org/images/coin-master-daily-gift-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
    • http://loriginedupain.org/images/roblox-free-robux-2021-no-wait_GM431946152.pdfIn PDF document text
    • http://loriginedupain.org/images/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://loriginedupain.org/images/wizard-hacks_GM479516143.pdfIn PDF document text
    • http://loriginedupain.org/images/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://loriginedupain.org/images/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AB0 24840 bytes
SHA-256: 471992f64171e3a20286f3d1e9cc51be63c9d632047bcb243a80d7ff28e36a37
font_01_sfnt_off00008300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8300 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off00008fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA8 18732 bytes
SHA-256: 07b3e33c291e45f00076159c60893e35556df751ced0807d9a7dfc6572b8c8dd

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