Malicious PDF — malware analysis report

Static analysis result for SHA-256 56226b99ce4bb26c…

MALICIOUS

PDF

35.1 KB Created: 2021-06-25 18:04:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: f5b5c736f30eb39a9a4b3406f478b6e4 SHA-1: 287427e046172565c674894901cb1a81a5314c05 SHA-256: 56226b99ce4bb26c6117fbac8a1572778c20b7962cba5b4794c88ae385580376
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of 'free Robux' and game hacks to entice users. It contains numerous links to external PDFs and a primary redirector URL, indicating a tactic to drive traffic to potentially malicious sites. The presence of a download button lure further supports the malicious intent of leading users to unwanted content or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/free-robux-no-human-verification-2021-android-game-hack In PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/free-robux-now_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/pokemon-go-free-007_GM1094591345.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/rbx-land-free-robux_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/how-to-get-free-skins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/cute-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/app-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/how-to-send-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/how-to-become-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FC2 22408 bytes
SHA-256: fd162952f787abfeecb366a1c95698cacf561857c4cecdbb8a01e9fbe6c9a56e
font_01_sfnt_off000061b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61B8 19912 bytes
SHA-256: f3c91d69d300bdbbb0257f72669479450a91f221330e18a0ee40700a2bc7cf23

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