Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c487a6adb13c107…

MALICIOUS

PDF

35.5 KB Created: 2020-09-02 13:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 50010b41d937779010a28154ef855539 SHA-1: 638591e673f9554afef35a5ad2f2691c5b0b1c39 SHA-256: 2c487a6adb13c1078886eaedc3bcb30dc2d8ff521dfe4774d538fd1ddd252b3f
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.link/pify?keyword=censures+informally+crossword+clue+6+letters 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/60933b_f13dc5015b62460a8476bc459f66c693.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_d4b78f0c91ff4000a4e5cf4d52f44875.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/daca0d_975c695ced1a4c1a90445e084a399320.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/87fdc7_fb3147713af34709bbaec6bdfab09d8e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_0bc6a4492a024c3e8a63f388d20d6214.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4f270c_3eb5e224474b4c0b989d7527df17c5d8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/eddc50_dfe08b7e34fa497e92196be06e1519d1.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a0905b_9b330b4da2a64546ab54d32928760873.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_a76e980b1f39450f951d76a58e35e1f6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/46429b_7877061abc194354a9c9c7fc5efd6cb5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/7ef0dc_5f2e2e40eb90432686f982c6a0fe27d7.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/5360f8_d4c9e961cb7647e6ae56ae5c7993614e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b7082a_e0ffc438f05f4ed89cf1b4685b26f468.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_779b68eb25c74137b70b912d9a4bf8a8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f0e51d_fec1a7c020ee424b8a5e7645f4e1643d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/285be4_8d5d942b947b4642af4637976f7a63f2.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_off00004bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BD4 5420 bytes
SHA-256: 996f995c2633f6d546ec1eacf5a17c5d49e483cde39b81e553ec3a3755b997f5
font_01_sfnt_off00005e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3F 10072 bytes
SHA-256: a51bb29546bf172df4716aad91b0dd7f9d2865acc4eb0779dabdcebcb452a5fc

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