Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a4746eeba8321b…

MALICIOUS

PDF

39.0 KB Created: 2020-08-24 00:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e8092407f1c4cee2b541f332fc1a939 SHA-1: 6dcc25346a52eac1415ecaae4fc3ae853ab7494b SHA-256: 62a4746eeba8321b499dd53945a071db66ed58ae1d51e0f25f39a74cd3632621
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains a URL that appears to be a lure for CV templates. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL suggests an attempt to lead the user to a malicious site.

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.ru/pify?keyword=best+cv+design+template+word+free
    • http://files.docksideengraving.com/uploads/1/3/2/7/132740519/saxekisod.pdf
    • http://files.michaelvitotosto.com/uploads/1/3/1/8/131857914/bafoxapulosoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/2034590739.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepikopu.pdf
    • https://cdn.shopify.com/s/files/1/0439/9159/7214/files/23790921237.pdf
    • https://cdn.shopify.com/s/files/1/0438/6213/0853/files/paint_3d_for_windows_7_ultimate.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/94221548571.pdf
    • https://cdn.shopify.com/s/files/1/0434/0659/0106/files/buwatofase.pdf
    • https://cdn.shopify.com/s/files/1/0430/7920/5013/files/html_form_comment_field.pdf
    • https://cdn.shopify.com/s/files/1/0429/2693/2124/files/unix_shell_scripting_tutorials_point.pdf
    • https://cdn.shopify.com/s/files/1/0431/7298/7046/files/mivunimujegag.pdf
    • https://cdn.shopify.com/s/files/1/0441/2047/3752/files/hey_there_delilah_piano_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/3913/6661/files/sebotoratomu.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_off00005bd8.bin
314bd81059b252a07270aaf681945cf68d1d5a349cc052a64cade8f4a25a0e4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD8 5676 bytes
font_01_sfnt_off00006f24.bin
61ddd8981a7b132abc34fc93d2ee7490e20ebb1d04ba3675a75407f102e7e0a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F24 9428 bytes