Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af3b40a3f98dc08…

MALICIOUS

PDF

43.6 KB Created: 2020-08-22 01:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f91bd7c87370f7a48568af425c0bb26 SHA-1: 5308e4683dc5c14a0068417e7d9012e4d6185e38 SHA-256: 5af3b40a3f98dc08693ec22c3856f13d578bfbb207efed592f908dce7fffa64d
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a link farm, with numerous embedded URLs, including one that leads to a Shopify domain. The document body, though heavily obfuscated, contains the same redirector URL, suggesting an attempt to disguise its malicious nature. 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=asian+dating+app
    • http://files.bradsherk.com/uploads/1/3/1/1/131163851/mikimalapoli_jodikej_nitogugifu_xenolumikeli.pdf
    • http://pomozumu.garnseysferalacres.com/uploads/1/3/2/7/132741508/vudekaw_gikaveteguwixel_kumajubamoj_luzovabolegiwi.pdf
    • http://javubiso.shamansspirit.net/uploads/1/3/1/4/131407406/dimos_poloxiboki.pdf
    • http://files.sacredgeometryalchemy.com/uploads/1/3/0/7/130740242/pagakanejelu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0462/6140/3802/files/fawidevovisab.pdf
    • https://cdn.shopify.com/s/files/1/0435/5640/5411/files/define_aerobic_exercise.pdf
    • https://cdn.shopify.com/s/files/1/0427/8507/9452/files/zapiwajobinulozimizatob.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wurawosupamajo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6523/6886/files/clasificacion_de_los_seres_vivos_primaria.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66541571973.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3001/files/26157644338.pdf
    • https://cdn.shopify.com/s/files/1/0437/3463/0554/files/dekudadi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6109/2250/files/xudamel.pdf
    • https://cdn.shopify.com/s/files/1/0431/8242/4215/files/16031440073.pdf
    • https://cdn.shopify.com/s/files/1/0431/1154/7037/files/kinifekagukelutas.pdf
    • https://cdn.shopify.com/s/files/1/0435/2180/2404/files/s_item_ids.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/regulatory_reporting_manager_job_description.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_off00006c49.bin
661fe0d81bb95fd952e26490400fc4b67b4b013810068759fe5d3430ac0c0ffc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C49 4988 bytes
font_01_sfnt_off00007d4e.bin
cb3b67cd6d37f23422e74c588d4423360caf5a4b9f7e976730ad037f43bfb981		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D4E 10732 bytes

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