Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd995c51a0612f8…

MALICIOUS

PDF

39.8 KB Created: 2020-08-14 21:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 030f6ccd19c64fb20081aa68e0f05c49 SHA-1: e44169109bb01effd3ce3466b1bd26b4de35bdad SHA-256: 5cd995c51a0612f8820ad55ff2890e8704ab795c728b2b6092e4d38bfc2197c6
154 Risk Score

Malware Insights

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

The PDF document contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a 'certificate of participation template'. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO manipulation tactic to distribute malicious content. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=certificate+of+participation+template+editable+free
    • http://files.warriors-hope.org/uploads/1/3/1/0/131071037/toxutivuzam-likudew-zelalabatu-lujesapoz.pdf
    • http://rupodelew.shadowcreekchoir.com/uploads/1/3/0/8/130813528/kedam.pdf
    • http://vuzij.melissaraehairstylist.com/uploads/1/3/2/6/132695615/5455044.pdf
    • http://files.madisontnt.com/uploads/1/3/1/3/131383772/gupakaguzise.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/6467/0873/files/sanyo_tv_remote_codes.pdf
    • https://cdn.shopify.com/s/files/1/0430/1619/2153/files/zotixum.pdf
    • https://cdn.shopify.com/s/files/1/0435/4477/2759/files/8348243199.pdf
    • https://cdn.shopify.com/s/files/1/0432/2633/3351/files/lukawedini.pdf
    • https://cdn.shopify.com/s/files/1/0428/8305/5782/files/rawupuborafonirutas.pdf
    • https://cdn.shopify.com/s/files/1/0433/8571/6901/files/blood_lipid_profile.pdf
    • https://cdn.shopify.com/s/files/1/0433/8227/6250/files/rubomopaxasibosaru.pdf
    • https://cdn.shopify.com/s/files/1/0451/0456/2328/files/anglishtja_e_re_pa_mundim.pdf
    • https://cdn.shopify.com/s/files/1/0433/3142/0314/files/kawiwavipipowejur.pdf
    • https://cdn.shopify.com/s/files/1/0433/2807/7992/files/pawujura.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/kojugasi.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_off00005f6d.bin
3286cdcb2bea8d1b578daa4f658f821595ccd80dd92c92c833789fa3d3c132c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F6D 5168 bytes
font_01_sfnt_off000070dc.bin
f818c1de2df238125c71b3bc38b6db9d55bb25e4f8bb18579743d15cb547a1a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x70DC 9676 bytes