Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e0cac789a1c758…

MALICIOUS

PDF

47.6 KB Created: 2020-08-28 13:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27d00bdb0df651d4735043465503a69d SHA-1: cbd4bd503fe04241920d6760ac48e0787d4d6f31 SHA-256: 21e0cac789a1c758f69e359dbbfdf39bf72c550fcaae21d7bcadb651aa1e6b36
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector, and another identified a large link farm. The document body contains text that appears to be metadata from the PDF generation tool, along with the malicious URLs. The primary attack pattern involves luring users to click on these links, which likely lead to further malicious content or phishing pages.

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.ru/pify?keyword=the+scientist+and+engineer%2527s+guide+t
    • http://files.dndamsels.com/uploads/1/3/0/7/130775023/jupaguferuke-bigapod-wujovisumezizod.pdf
    • http://files.jacksongirlssoccer.com/uploads/1/3/1/3/131380612/jukasowopulib-derafunuxuvofud-bolopori-nigagutofifitoz.pdf
    • http://suzitonup.aliciahenderson.net/uploads/1/3/0/7/130740086/92c1f18f.pdf
    • http://nopape.justmichiganmade.net/uploads/1/3/0/7/130776330/punokoderun_xupaf_girekosozupise_bodorew.pdf
    • http://files.francofestcalgary.com/uploads/1/3/1/4/131437765/xonuze_miwemoje.pdf
    • https://cdn.shopify.com/s/files/1/0431/0568/1562/files/50705383972.pdf
    • https://cdn.shopify.com/s/files/1/0430/3945/7431/files/50133136282.pdf
    • https://cdn.shopify.com/s/files/1/0430/0495/2735/files/bezoxaxofobofekuduk.pdf
    • https://cdn.shopify.com/s/files/1/0431/5811/0363/files/titepesijaxovuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/1403/7409/files/communication_barrier_definition.pdf
    • https://cdn.shopify.com/s/files/1/0433/3928/4645/files/1717935510.pdf
    • https://cdn.shopify.com/s/files/1/0451/9487/0935/files/conjunctive_adverbs_worksheets_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/3941/6732/files/votixuwut.pdf
    • https://cdn.shopify.com/s/files/1/0429/2640/7833/files/gupewariruveme.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007cbb.bin
860fbb202d7b44b7d00a9b6cdb84e8197cafb700fe1660e618334d95aa9431f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CBB 5152 bytes
font_01_sfnt_off00008e37.bin
6b6d1afcc54e01dbdf4800667ee55b093a7b08471531d3189667022bcf6af097
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E37 10408 bytes