Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66e36e07fbe2bf0…

MALICIOUS

PDF

40.9 KB Created: 2020-10-08 19:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3388f6917471d5921e4ff5e3c961b8ee SHA-1: d4a9c4419599a599d9908364ea6c9ba8153deef2 SHA-256: f66e36e07fbe2bf0ed91411986b9b0996f725841515ee652fc4b0b09a2f27590
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure for adult content and includes the malicious URL. The presence of a 'Browser extension / update installation lure' heuristic further indicates a social engineering attempt to trick the user into clicking the link, likely to download a payload or lead them to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ggtraff.ru/strik?keyword=free+unblocked+porn In PDF document text
    • http://files.berksdogtraining.com/uploads/1/3/1/3/131398295/1070349.pdfIn PDF document text
    • http://fefufa.partscare.aero/uploads/1/3/1/3/131380213/0d4da84562e.pdfIn PDF document text
    • http://files.eldiablo.ca/uploads/1/3/0/8/130874019/xezupuruf.pdfIn PDF document text
    • http://files.wholeistichealing.net/uploads/1/3/1/8/131871907/8364154.pdfIn PDF document text
    • http://files.mrainc.com/uploads/1/3/2/6/132681409/9603722.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6596/1367/files/quantitative_experimental_design.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0542/5310/files/pukaririworaduto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4162/2682/files/hytale_beta_launch_date.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8113/7316/files/mowedogowuzuxilefej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1389/7879/files/69959434532.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/1696/2215/files/mooligai_samayal_in_tamil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0990/0184/files/tulamibexakaloti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9415/5170/files/vidufesafipolovoki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/1014/5694/files/osrs_75_def_pure_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/9382/4166/files/battery_operated_blenders_walmart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9602/4261/files/how_to_say_great_answer_in_spanish.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0242/9092/files/dimiwagosasota.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6105/9482/files/sagajigogopofiroligagu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7872/7318/files/godufodevigup.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6125 4836 bytes
SHA-256: 8091dd2d4579dc8d5350564f3b58710e2c42075c36ee82c6700f5e95e5494bf7
font_01_sfnt_off000071a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71A6 10720 bytes
SHA-256: 8c4e8b20432880b6e19e4ee9359c0196bb2c3d515d607b255b7b7c9fc6b1ff6b

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