Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f775c5461e1b275…

MALICIOUS

PDF

39.3 KB Created: 2020-08-12 16:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6d6ac6a95ec091f6a249d3bb037a16f SHA-1: 0418eb4cb5abbd66b4e12dd511402ec87147d1e7 SHA-256: 1f775c5461e1b275aa92ea7a5789a2e29dd708b01f92a94359f5c9302c5cc2cd
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many pointing to PDF files hosted on various domains, which is characteristic of a link farm. One of these links, 'https://ttraff.cc/pify?keyword=regions+of+the+world+pdf', is identified as a known malicious redirector. This suggests the document is designed to lure users to malicious infrastructure, potentially for further exploitation or phishing. No scripts were extracted, and the document body was heavily obfuscated.

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/pify?keyword=regions+of+the+world+pdf
    • http://situkopix.apexoutreach.com/uploads/1/3/2/8/132814975/5143584.pdf
    • http://files.mosiacpreschool.com/uploads/1/3/1/3/131398140/9d8afe.pdf
    • http://folusulel.richmondinfo.net/uploads/1/3/1/4/131410227/169b68f.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/romanticism_characteristics.pdf
    • https://cdn.shopify.com/s/files/1/0432/5317/0334/files/rotidenasenijagazawetugi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81858120772.pdf
    • https://cdn.shopify.com/s/files/1/0434/3024/8600/files/xaroxep.pdf
    • https://cdn.shopify.com/s/files/1/0433/8761/7447/files/92066233074.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8710/files/world_breastfeeding_week_theme_2020.pdf
    • https://cdn.shopify.com/s/files/1/0435/3166/5562/files/arduino_a_quick_start_guide_maik_schmidt.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44484222312.pdf
    • https://cdn.shopify.com/s/files/1/0431/3235/4711/files/tally_erp_9_interview_questions_and_answers_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0428/5690/6918/files/pebijupomixujo.pdf
    • https://cdn.shopify.com/s/files/1/0438/4853/2128/files/xesajelupowureze.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36726725464.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_off00005c84.bin
63e46f326af85060fc99693bc51b76a04b51eb094848b2e6b1425a46e74fa719
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C84 5192 bytes
font_01_sfnt_off00006e41.bin
b58b066119a61287ad557a19d8983fe7a1d58414e6104da102261212fa7c92c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E41 9908 bytes