Malicious PDF — malware analysis report

Static analysis result for SHA-256 753b846b33b80576…

MALICIOUS

PDF

50.9 KB Created: 2021-06-11 10:03:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 71ea8484ec99d0244bd2fb643d8d699b SHA-1: b06e12dfd2bc7bcb4e2ba83272354f0ea6da41ac SHA-256: 753b846b33b80576970fd20403a34ebc6e6361e1fd12a3db866897495b07de15
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to SEO-optimized PDF files, suggesting a link farm or content-scraping operation. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://netcdn.tw/app/431946152/roblox-hack-de-robloxde.com-game-hack'. The presence of a visual download button lure further supports the malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links indicate a campaign to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9724

Heuristics 4

  • 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.tw/app/431946152/roblox-hack-de-robloxde.com-game-hack In PDF document text
    • http://digilib.stimata.ac.id/repository/free-rare-cards-for-coin-master-christmas_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/mcpe-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-spin-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/cheat-roblox-lumber-tycoon-2-engine_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-spins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-reward-link_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-hack-version-download-2021-android_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/master-game_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-do-hack-piano-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/roblox-counter-blox-wall-hack-download_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/oprewards-points-generator_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/robux-hack-with-phone-number_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/roblox-help-free-robux_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005484.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5484 27896 bytes
SHA-256: 43101a5351bdeb427aee1db7a9878737ea1770fd291819a65e91ccd257056f7f
font_01_sfnt_off00009585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9585 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000a296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA296 18852 bytes
SHA-256: 6302760189925f61aa84e4cc553d83186dcdb393743701ced3ec08625aa44565

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