Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f49a6b8e607524a…

MALICIOUS

PDF

40.0 KB Created: 2020-08-26 00:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93fe264218cb71f9476db416057adf46 SHA-1: ef9c31a52f1bfb77d3e7103adbc3d5308997d683 SHA-256: 0f49a6b8e607524ad2526d2c5510e61d16f57c4b22f57a28d11f9febd088cf65
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a primary malicious redirector URL, indicating an attempt to drive traffic to malicious sites. The document body, though heavily obfuscated, contains the text "video game reviews for parents" and the malicious URL, suggesting a lure. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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.club/pify?keyword=video+game+reviews+for+parents
    • http://files.cadellcabins.com/uploads/1/3/2/7/132712326/tugutumowumerak_medapolawo.pdf
    • http://files.thestylegunn.com/uploads/1/3/0/7/130740589/6492487.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4980/3166/files/66189986469.pdf
    • https://cdn.shopify.com/s/files/1/0430/9975/0560/files/zajiborajiwux.pdf
    • https://cdn.shopify.com/s/files/1/0435/2793/0011/files/66623747097.pdf
    • https://cdn.shopify.com/s/files/1/0436/2177/7570/files/weekly_planner_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/9037/0975/files/xozutewew.pdf
    • https://cdn.shopify.com/s/files/1/0447/7422/8117/files/cholera_treatment_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0462/6140/3802/files/kufinedagonulijadake.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasodidupafulad.pdf
    • https://cdn.shopify.com/s/files/1/0430/4168/5665/files/shadowing_let_s_speak_japanese.pdf
    • https://cdn.shopify.com/s/files/1/0431/4041/5644/files/civ_5_beginners_strategy_guide.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_off00005d54.bin
9e20e91de5f974f5b7c4e0ad8ed1e22b5611514f1f1f1fc447a52f14ee498bcb
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D54 5448 bytes
font_01_sfnt_off00006fe3.bin
543521fecc9dcccbe513e6c74eea0f2195949e3d0fb19b3ae02f7b128da2a4ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE3 10520 bytes