Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c85b70462f4ebe…

MALICIOUS

PDF

39.0 KB Created: 2020-08-14 05:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae5e5907ff808126b63b85dcf7ac18f9 SHA-1: c919da4d57dfcd3b8f066ebf48f384ddc796c13a SHA-256: 62c85b70462f4ebecaa76b31d5d7b762bbd10288a88c2ee75df77f0373b24b07
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one identified as a malicious redirector, and is flagged by ML classifiers as malicious. The document body, though heavily obfuscated, contains text and URLs that appear to be part of a link farm designed to drive traffic to potentially malicious sites. The presence of multiple Shopify URLs, some confirmed benign and others unknown, suggests an attempt to blend malicious links with seemingly legitimate ones.

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=space%20maintainers%20in%20pediatric%20dentistry%20pdf
    • http://files.loverepurposed605.com/uploads/1/3/1/0/131071243/e7c377.pdf
    • http://files.restyle-homestaging.com/uploads/1/3/0/7/130775557/4f18c3a27a480.pdf
    • http://files.ascotdance.co.uk/uploads/1/3/1/8/131871864/ravojomewiwojun.pdf
    • http://files.cathleenmargaret.com/uploads/1/3/0/7/130775027/woxubo_mixuzegaxi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/4285/5319/files/38438440278.pdf
    • https://cdn.shopify.com/s/files/1/0430/4620/7650/files/pitepapetuwomu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8105/6935/files/tumuvemododadefom.pdf
    • https://cdn.shopify.com/s/files/1/0432/6001/8852/files/viruduravugisavexijawo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4457/7185/files/fosavalemeka.pdf
    • https://cdn.shopify.com/s/files/1/0439/3051/7672/files/61067421798.pdf
    • https://cdn.shopify.com/s/files/1/0431/0774/5958/files/yield_point_phenomena_in_metals_and_alloys.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/vebuvugoxajazafegofi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6110/9155/files/vimovivovabe.pdf
    • https://cdn.shopify.com/s/files/1/0437/4600/1045/files/capillary_gel_electrophoresis.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_off0000598d.bin
6403da56e9609f36a097b1c0801ea9b0974b62e0792e4129fbf2afc45502347e
pdf-font-stream PDF embedded font (sfnt) at offset 0x598D 5472 bytes
font_01_sfnt_off00006c10.bin
cf624f72db52e7308106de6dcc2829734a2046ff4fb7a6671c9e2dd3d997a16d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C10 10792 bytes