Malicious PDF — malware analysis report

Static analysis result for SHA-256 085ff63a84305bc4…

MALICIOUS

PDF

38.7 KB Created: 2020-09-06 19:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4071c0220b2b828ce205b74442384065 SHA-1: bf5e3c871c8cee4becb6486ecf2f8e3d7714532a SHA-256: 085ff63a84305bc424db51d6ad835d8c13288367020bc47725e8f439471548e9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to a 'Santa's workshop invitation template' and the malicious URL. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm or spamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/wix?keyword=santa%2527+s+workshop+invitation+template
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/f90bad_10e153e845fa46ceaf87eba0448130a0.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_c178c193993647daa74364f799d5318a.pdf
    • https://static.usrfiles.com/ugd/930050_88ba3d1475e64c2395c12b4cf7031d97.pdf
    • https://cdn.shopify.com/s/files/1/0434/8415/1974/files/nevenuwoxowewamuludawi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9516/files/nusotiwodotexopeberumi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8519/3621/files/4651984746.pdf
    • https://cdn.shopify.com/s/files/1/0427/9920/2467/files/44129754208.pdf
    • https://cdn.shopify.com/s/files/1/0431/4205/4048/files/college_algebra_clep_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0434/5734/7749/files/jojumagopetuzi.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/givitebo.pdf
    • https://cdn.shopify.com/s/files/1/0440/8256/1176/files/25417579720.pdf
    • https://cdn.shopify.com/s/files/1/0435/3009/2712/files/practical_aviation_security_3rd_edition.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a75.bin
d49bf1558f7db531213da69383021c466b31f8c79fb1b6acad3b1edd6ae50554
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A75 5412 bytes
font_01_sfnt_off00006cce.bin
4f5f280faee27ffed5e05c5b4d01b4f303ce94678b638862fdfe904c20736761
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CCE 9732 bytes