Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4dcc75c5f90478b…

MALICIOUS

PDF

48.9 KB Created: 2020-09-02 10:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: d4b5fdd853d6f288b493fd26512f6c4b SHA-1: 25e231f7fb02b7f527431c3f6d307d07409c99d0 SHA-256: c4dcc75c5f90478beecb3201110f50c3fd99699009e24d556913c6d7827ab3d8
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.me/wix?keyword=gnossienne+no.+1+piano+sheet+music+pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/8ebb60_b310ac842c514a888b24fed6b26644f5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f4de5e_af26e2b9bbad4645b61adae85fa13c05.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_a9cc06c6fb374e959498cb5485af8591.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/32777b_a5a8ca673bff44eabe29c3be1200d31d.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6406/5188/files/razipovegafitejod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3942/4669/files/bipajilejivekili.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cfa91a_66f112fdf84d465cacd1971e85d40f6e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/22bf55_9971634438db48c0a5d337f50cc0d28a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b910ae_82aa461e9b4e43b997f4da52f8e3e71b.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2559/4530/files/viwunafapibegabojuzi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1808/4771/files/linear_guide_rail_assembly.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B30 5384 bytes
SHA-256: 46e35443f756723896192a07e1a58d5bf77eb582b36b0e4b08e87d414af9a579
font_01_sfnt_off00006d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D6A 16152 bytes
SHA-256: 68ed4e9f8a7c1a96ed4f956e725552e0773a882ee538b0be5128aa75b82dfe41
font_02_sfnt_off00009f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F6D 16120 bytes
SHA-256: 46d9b83afd797048ab251ddfc9ca9a6db44f3280724c231f6a80a061bcc6fc12