Malicious PDF — malware analysis report

Static analysis result for SHA-256 9556f877271efdec…

MALICIOUS

PDF

48.2 KB Created: 2021-06-04 05:57:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: cc3a7c5afb9a645478d451bb14b4119e SHA-1: 0df5fa91d3472e85553eae1c982a700d18838439 SHA-256: 9556f877271efdec025b0164a3a4c8d5b50f9204e733c272b19a89ad84f4fb1c
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 0.9796

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.online/app/406889139/coin-master-free-spins-daily-fb-champion-game-hack PDF link annotation
    • http://katalog.gemalibrary.net/repository/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-come_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-free-pet-food-links_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-roblox-executor-no-key_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/minecraft-114-download_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-spins-and-coins-com_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-hack-version-apk-download_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-hacked-apk-download-for-android_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
stream_004_off00005219.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5219 25716 bytes
SHA-256: 88873e077698fc2635a20d2ab8b120178e0e0a8ece19602f9ae332f415236fc0
font_01_sfnt_off00008e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E42 2880 bytes
SHA-256: b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e
font_02_sfnt_off0000982c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x982C 18892 bytes
SHA-256: 3948d10236dc370d2518b349d49f2c891a1cd8413c3f3a4e1d86a41b35aa018f

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