Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b027fd39ca7281d…

MALICIOUS

PDF

41.7 KB Created: 2020-08-04 17:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6637635d3184b47585d71a6985e30005 SHA-1: 5c931afe4723be31370857f0ce8a96f647c2ae4a SHA-256: 6b027fd39ca7281d22c3fc9a53946cf3bf93ae27395bcbab4a5e16d08c8d1699
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 external PDF files, suggesting a link farm for SEO manipulation. One of the primary links redirects to a known malicious infrastructure, indicating a phishing or malware distribution attempt. The document body, though partially corrupted, contains text related to "12 principles of animation pdf" and the wkhtmltopdf application, likely a lure to encourage clicks on the malicious redirector.

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.cc/wb?keyword=12%20principles%20of%20animation%20pdf
    • http://files.caledontreeconsultants.com/uploads/1/3/0/8/130813095/sogireferem.pdf
    • http://files.arkumc.org/uploads/1/3/2/8/132815753/misusewofotopesapufa.pdf
    • http://jereni.canadiancashmere.ca/uploads/1/3/0/7/130775169/negovatomo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bobidaxida.pdf
    • https://cdn.shopify.com/s/files/1/0432/5765/9547/files/17010563101.pdf
    • https://cdn.shopify.com/s/files/1/0434/1104/6561/files/fipajawejinolofe.pdf
    • https://cdn.shopify.com/s/files/1/0433/8129/3221/files/52344626960.pdf
    • https://cdn.shopify.com/s/files/1/0436/5221/9030/files/beverage_production.pdf
    • https://cdn.shopify.com/s/files/1/0439/0184/5659/files/garmin_forerunner_10_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/6779/3820/files/holy_bible_in_arabic.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/telikakeriwavemowo.pdf
    • https://cdn.shopify.com/s/files/1/0428/6559/0438/files/xetulezi.pdf
    • https://cdn.shopify.com/s/files/1/0429/0763/1782/files/rizuzigopesuxifipokew.pdf
    • https://cdn.shopify.com/s/files/1/0431/9199/2480/files/fidumezoxozisemob.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_off00006643.bin
0b84c66e5ccc83bc388c456b979b839e043da3ba862ec7e0ea4fad4a40076f80
pdf-font-stream PDF embedded font (sfnt) at offset 0x6643 5392 bytes
font_01_sfnt_off00007885.bin
ad82a9351a250171287336f263a334a9146507e4f82316f355f046252c839d4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7885 9892 bytes