Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fc1a3aa5321301…

MALICIOUS

PDF

72.7 KB Created: 2020-11-02 17:46:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-10
MD5: 19f5eb4befa1f52328601c7c6743fe1c SHA-1: d91fae617896970a6fe40051ed2c64edaee21685 SHA-256: 41fc1a3aa532130178564286cc6ff2894fd7ce95f9fbb622f8c3e8d0f5e1d726
194 Risk Score

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.
  • 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.
  • 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://ttraff.club/pify?keyword=doppler+effect+formula In PDF document text
    • https://suleduzon.weebly.com/uploads/1/3/4/4/134403341/larekurat-numavokejo-lixulekubufi.pdfIn PDF document text
    • https://disadoxamegipu.weebly.com/uploads/1/3/4/5/134527150/2606708.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/65100f.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/kinufijozulof.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000c000.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000c000.bin)
    • https://s3.amazonaws.com/dapekufoxiraku/53432563939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5cea81b-7af6-47c6-8b5f-10ec1ccd584a/pajoxupusoxodenikes.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/wojufozudalejevaxon.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/apk_downloader_for_pc_games.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9133/8428/files/neil_gaiman_make_good_art_speech_transcript.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/xojosanelonupolisobugeri.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0923/6374/files/7753695299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d4205a6-5e09-4585-ab65-47f8b7dda836/radesaduzo.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 extracted file (font_00_sfnt_off0000c000.bin)
    • http://dejavu.sourceforge.netIn extracted file (font_02_sfnt_off0000fe74.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_02_sfnt_off0000fe74.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC000 4980 bytes
SHA-256: 63c755ac670e120e1e1d2f3d50e2c91247dfb1b8ba06cb2dc430fe7b22e08565
font_01_sfnt_off0000d0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E0 13992 bytes
SHA-256: d99c8223a88177c1accef208cd9ce4d93eb71d3ffc6e0e31369a1d89bfbe6595
font_02_sfnt_off0000fe74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE74 16252 bytes
SHA-256: 7e34e892be4157eaed053e4618af85e4f93600da19c71a5c72f68909d7dcda3a