Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c39ac4f8bee4ef2…

MALICIOUS

PDF

35.4 KB Created: 2021-07-08 15:24:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 28eb1a5712c5a260e2b578909dc3b7f8 SHA-1: d6e79166bad43d5936607d96897be773f985e6b9 SHA-256: 0c39ac4f8bee4ef25331320088cddbc1c3b485f6af859f6463d1a7e0701ebd23
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 http://netcdn.tw/app/431946152/how-to-get-free-robux-on-computer-game-hack PDF link annotation
    • https://razredna-nastava.net/files/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-to-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-free-spins-link-deutsch-ios_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-does-cheat-engine-still-work-on-roblox_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-generator-no-survey-no-hack_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/robux-hack-github_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/minecraft-xray-hack_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-spin-coin-master-hacktoman_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/roblox-captain-underpants-game-free_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/minecraft-free-version-pc_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-to-get-robux-fast_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-minecraft-addons_GM479516143.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_002_off0000303b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x303B 23164 bytes
SHA-256: d732d2e211c1b3bbf86a35d2c8b76e040053c151853d6d65341e849998344d98
font_01_sfnt_off00006463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6463 19420 bytes
SHA-256: 4eeda5a53974dafe6a6a7eb0474e8c00647b290d21ead3df531c01c0ce008c20

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