Malicious PDF — malware analysis report

Static analysis result for SHA-256 afcaa8d7f4433f02…

MALICIOUS

PDF

61.2 KB Created: 2020-10-01 10:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 8e09d828b4ed185b20feeda28dc1daf1 SHA-1: 34af467188af3c8bc5299e218a52f1d906833305 SHA-256: afcaa8d7f4433f02d2ec98f1d382b44f9065a877b79d5c8fee9bdff1caf968ea
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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
  • 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://cctraff.ru/strik?keyword=importance+of+science+laboratory+in+schools+pdf In PDF document text
    • http://tubaj.crystaldragonreiki.com/uploads/1/3/2/7/132740449/besuguxowimelot.pdfIn PDF document text
    • http://files.averageguyreviews.com/uploads/1/3/1/6/131637108/2cf96.pdfIn PDF document text
    • http://files.prostatecure.org/uploads/1/3/0/8/130874252/rimimamenijo_giziju_venuluk_jadonati.pdfIn PDF document text
    • https://site-1036874.mozfiles.com/files/1036874/gaborusiwedem.pdfIn PDF document text
    • https://site-1036868.mozfiles.com/files/1036868/semaguvogekuwuwifolalufer.pdfIn PDF document text
    • https://site-1036935.mozfiles.com/files/1036935/vofug.pdfIn PDF document text
    • https://site-1036680.mozfiles.com/files/1036680/62241764142.pdfIn PDF document text
    • https://site-1038442.mozfiles.com/files/1038442/wuvapulalalujujezajoxu.pdfIn PDF document text
    • https://site-1040297.mozfiles.com/files/1040297/69919002299.pdfIn PDF document text
    • https://site-1037111.mozfiles.com/files/1037111/wenugitiloxadefexusipiv.pdfIn PDF document text
    • https://site-1037169.mozfiles.com/files/1037169/55317146391.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/1/0439/8632/1566/files/pixedezib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0106/0262/files/polufebefelevibil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0168/2852/files/maine_state_bird_and_flower.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9334/3899/files/53364806635.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6225/3978/files/23070590873.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7610 7088 bytes
SHA-256: d698c3e8f41a240b09b0897d898d5a508e41de7f2156909e40a72b5a89565b9d
font_01_sfnt_off00008825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8825 5576 bytes
SHA-256: 26504d7cb3d660f94e3425ac3b48a5903d3ac6ed0a9bfb6c54bcfae43398c83c
font_02_sfnt_off00009ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AE4 3080 bytes
SHA-256: 45a665c80deec4c52d5e943ae2369a7e6bae7b5976ebf68a25a9078d33fd2545
font_03_sfnt_off0000a7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7BA 12104 bytes
SHA-256: 07ab7a6ac9807309fc1682fcc35ad92997c8f092f81363b509cd64fcc4375326
font_04_sfnt_off0000cf8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8F 16756 bytes
SHA-256: 7316bb3569a30462c6946ded995ae0d87117bf3b72ccc615105a4132824bd013