Malicious PDF — malware analysis report

Static analysis result for SHA-256 817b9e37df902e24…

MALICIOUS

PDF

42.5 KB Created: 2021-05-12 18:30:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 6b2225b2bb890950aa2762fd54554fe4 SHA-1: f10815965846024e9942507f77c30d586a12aa7d SHA-256: 817b9e37df902e24ae736bac05d0c0f2a595173cb90aafd1ba774dc8fabf2725
182 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. It uses a password-protected-archive lure. 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 0.9971

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://netcdn.xyz/app/406889139/free-coins-and-spins-for-coin-master-game-game-hack PDF link annotation
    • http://katalog.perpustakaanlia.net/repository/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/free-spins-coin-master-links-thursday-november-28-2021_GM406889139.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/master-coin-free-link_GM406889139.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/roblox-robux-page_GM431946152.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/free-roblox-toy-codes_GM431946152.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/coin-master-hack-online-2021_GM406889139.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/free-coins-and-spins-coin-master-2021_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_003_off00004a8f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A8F 25452 bytes
SHA-256: 79f0f57d6bdac2a5412b31ee97a36defbb4a428825f208d4bf3c4287c0960783
font_01_sfnt_off000083cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83CB 18320 bytes
SHA-256: 2c95db8d02702652075be8f6568e083e0c31fb28563b2fbbcaccc1dd0c48c672

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