Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfdda0cb03b57cf5…

MALICIOUS

PDF

46.0 KB Created: 2021-05-14 05:19:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 7f8561545f4b2ae7fdad85a542ab2234 SHA-1: 3f75f3ecfa3d3c43a2185443c8c40b86951768cd SHA-256: cfdda0cb03b57cf506d6d484de4639dc36b45710b49b2bd0e8a16b152e5cf0c9
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 0.9980

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/431946152/free-robux-redeem-codes-2021-game-hack PDF link annotation
    • https://financia-business-school.com/static/upload/files/coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/free-daily-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/how-to-get-a-refund-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/free-daily-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/minecraft-complete-handbook_GM479516143.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/wwwcoin-master-free-spincom_GM406889139.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/coin-master-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/free-minecraft-windows-10-with-java_GM479516143.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/how-to-hack-someones-roblox-account_GM431946152.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_off00004aef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AEF 29412 bytes
SHA-256: cd9598dcae0a520fce00670abe38aa39606fe820cb0e23e9e78eb286f7eefc83
font_01_sfnt_off00008fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FC2 18852 bytes
SHA-256: 835008e062f354a08c5cd285c30dce0b291468b55589a8f36d5d300bab70ed7b

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