Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd064987448ed01b…

MALICIOUS

PDF

37.5 KB Created: 2020-08-14 11:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f40f27ad3ee2e447ffa7d5c7093130c5 SHA-1: 59c1a7474dfc89b583b1813ed6dc67a87e3be9da SHA-256: fd064987448ed01b9387eb144e099460c0cfa5a3fe8e3d31736253ebe897b47d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting seemingly benign PDFs, but one critical link redirects to a known malicious domain (ttraff.com). This indicates a phishing or redirection attempt, likely to lure users to a malicious site under the guise of downloading a grammar PDF. The ML classifier strongly supports the malicious nature of this PDF.

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.com/wb?keyword=fluent%20english%20perfect%20natural%20speech%20sharpen%20your%20grammar%20pdf
    • http://ravob.eatingwellisthebestrevenge.com/uploads/1/3/0/8/130814328/9847554.pdf
    • http://files.dandowland.com/uploads/1/3/0/8/130813841/mixutebavi_wigikoxupu.pdf
    • http://files.kaitlinrphotography.com/uploads/1/3/1/8/131856995/dc461264221bd.pdf
    • https://cdn.shopify.com/s/files/1/0428/7810/7811/files/zefuvafasutatosevesa.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9870/files/bojelebazizofopitorokazek.pdf
    • https://cdn.shopify.com/s/files/1/0431/2979/8818/files/ribusitudegapawogolak.pdf
    • https://cdn.shopify.com/s/files/1/0431/8108/0725/files/skyrimprefs_ini_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/2572/6625/files/86683474843.pdf
    • https://cdn.shopify.com/s/files/1/0430/5318/7221/files/17170775957.pdf
    • https://cdn.shopify.com/s/files/1/0428/3550/9415/files/adobe_acrobat_reader_dc_in_word_umwandeln.pdf
    • https://cdn.shopify.com/s/files/1/0428/0087/3631/files/82658117936.pdf
    • https://cdn.shopify.com/s/files/1/0438/3001/8210/files/mibose.pdf
    • https://cdn.shopify.com/s/files/1/0431/7167/6314/files/57524087322.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1079/files/nirejamivomiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/8160/5018/files/lettre_de_motivation_candidature_spontane_banque.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004680.bin
bc046cd88d8f0a3cf017ad80d1b0f8394fe3de7ee4d5e154b4477208ca5355d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4680 5508 bytes
font_01_sfnt_off00005919.bin
776d8d3b33a554aa7e643a3b374a12c35e6cc39cf8fdaa083d8fa395ef2d3ecf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5919 9740 bytes
font_02_sfnt_off00007a56.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A56 4324 bytes

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