Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad91251b5041f1d5…

MALICIOUS

PDF

45.2 KB Created: 2021-05-11 22:39:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2faab5e01a435e716bd5fd783bff63da SHA-1: 613f405893f4e32fc8642c4f117550bc64b77975 SHA-256: ad91251b5041f1d50d732c772b8dc74cb8c03f5301931a308dcc894c41ecebc0
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 0.9551

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 https://netcdn.xyz/app/406889139/how-to-get-free-coins-in-coin-master-game-game-hack PDF link annotation
    • http://www.santytextiles.com/uploaded_files/userfiles/files/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://www.santytextiles.com/uploaded_files/userfiles/files/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.santytextiles.com/uploaded_files/userfiles/files/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.santytextiles.com/uploaded_files/userfiles/files/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.santytextiles.com/uploaded_files/userfiles/files/free-spin-coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://www.santytextiles.com/uploaded_files/userfiles/files/free-spins-and-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://www.santytextiles.com/uploaded_files/userfiles/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://www.santytextiles.com/uploaded_files/userfiles/files/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.santytextiles.com/uploaded_files/userfiles/files/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://www.santytextiles.com/uploaded_files/userfiles/files/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://www.santytextiles.com/uploaded_files/userfiles/files/free-outfits-roblox_GM431946152.pdfIn PDF document text
    • http://www.santytextiles.com/uploaded_files/userfiles/files/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.santytextiles.com/uploaded_files/userfiles/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.santytextiles.com/uploaded_files/userfiles/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.santytextiles.com/uploaded_files/userfiles/files/coin-master-promo-code-2021_GM406889139.pdfIn PDF document text
    • http://www.santytextiles.com/uploaded_files/userfiles/files/get-free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://www.santytextiles.com/uploaded_files/userfiles/files/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • http://www.santytextiles.com/uploaded_files/userfiles/files/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.santytextiles.com/uploaded_files/userfiles/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.santytextiles.com/uploaded_files/userfiles/files/free-coin-master-spins-blog_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_003_off00004da4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DA4 24280 bytes
SHA-256: f5258caf08cb2ff1077897b84fd92488c5a051e78f7c6da0a3bcfdd4b0b5a2ef
font_01_sfnt_off000084f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84F2 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EDD 18136 bytes
SHA-256: c27ce28ced2cd6ab43782601ea0ea90fe7d4241e5cbb0f725251c39d19020edf

Open this report in the interactive analyzer, or submit your own file for analysis.