Malicious PDF — malware analysis report

Static analysis result for SHA-256 681b7c3d1116d7d4…

MALICIOUS

PDF

43.5 KB Created: 2021-06-03 09:36:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 91ce9caaba0e7096ada60a37e46f7292 SHA-1: a574d984ae9e0a9d6976b9645f00e65185df30c4 SHA-256: 681b7c3d1116d7d4187d70ad8bf83bc49afb28476ffb6331188e8c73f8f49f16
220 Risk Score

Malware Insights

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

The PDF contains multiple links designed to lure users with promises of game hacks and free resources. These links redirect to malicious infrastructure that hosts a large number of other PDF files, indicating a link farm or SEO manipulation scheme. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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/feb-23-2021-free-coin-master-spins-game-hack In PDF document text
    • http://wadimor.co.id/media/imagesfiles/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://wadimor.co.id/media/imagesfiles/how-to-make-your-own-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • http://wadimor.co.id/media/imagesfiles/free-spins-coin-master-april-2021_GM406889139.pdfIn PDF document text
    • http://wadimor.co.id/media/imagesfiles/hack-coin-master-online-without-human-verification_GM406889139.pdfIn PDF document text
    • http://wadimor.co.id/media/imagesfiles/pubg-uc-india_GM1330123889.pdfIn PDF document text
    • http://wadimor.co.id/media/imagesfiles/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://wadimor.co.id/media/imagesfiles/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://wadimor.co.id/media/imagesfiles/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://wadimor.co.id/media/imagesfiles/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • http://wadimor.co.id/media/imagesfiles/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • http://wadimor.co.id/media/imagesfiles/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://wadimor.co.id/media/imagesfiles/minecraft-free-education_GM479516143.pdfIn PDF document text
    • http://wadimor.co.id/media/imagesfiles/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://wadimor.co.id/media/imagesfiles/coin-master-hack-2021-no-survey_GM406889139.pdfIn PDF document text
    • http://wadimor.co.id/media/imagesfiles/coin-master-hacks-for-android_GM406889139.pdfIn PDF document text
    • http://wadimor.co.id/media/imagesfiles/coin-master-free-spins-for-iphone_GM406889139.pdfIn PDF document text
    • http://wadimor.co.id/media/imagesfiles/daily-spin_GM406889139.pdfIn PDF document text
    • http://wadimor.co.id/media/imagesfiles/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://wadimor.co.id/media/imagesfiles/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://wadimor.co.id/media/imagesfiles/google-how-do-you-get-free-robux_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_004_off00004fdc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FDC 23992 bytes
SHA-256: ee62308d2a309ecdf47bc86c58d7b232302b057f603e2d6ee297ce5bbd926b32
font_01_sfnt_off0000865c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x865C 18620 bytes
SHA-256: e4df661a92880538668b358c87f5272d6176bbf79a36016d2a0b4349a414f314

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