Malicious PDF — malware analysis report

Static analysis result for SHA-256 1257ded546b79278…

MALICIOUS

PDF

45.6 KB Created: 2020-08-19 07:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05a5eac4a4957c584b5b80b750d589bb SHA-1: d306bce9396002748fa08444120818f6c16e610b SHA-256: 1257ded546b7927868dc90493f445966c94fc66ecf297ef314b010a6a5c30454
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'counter strike 2 game for pc' and a URL that appears to be part of a link farm. 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.cc/pify?keyword=counter+strike+2+game++for+pc
    • http://files.sunshinephotographys.com/uploads/1/3/0/7/130776452/48e67b6b33b94a6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/0763/1782/files/30468758457.pdf
    • https://cdn.shopify.com/s/files/1/0432/0673/8079/files/queen_s_university_business_information_technology.pdf
    • https://cdn.shopify.com/s/files/1/0432/6899/7283/files/94873191992.pdf
    • https://cdn.shopify.com/s/files/1/0436/1617/4243/files/classroom_objects_crossword.pdf
    • https://cdn.shopify.com/s/files/1/0431/8055/6452/files/makil.pdf
    • https://cdn.shopify.com/s/files/1/0435/8055/5419/files/mumarisasidagusimej.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9430/files/naxukoxijolozexax.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/atoi_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0431/8032/7076/files/linux_commands_for_networking.pdf
    • https://cdn.shopify.com/s/files/1/0440/8039/8486/files/blanche_neige_grimm.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006513.bin
e90bc23304bfbaa05ba7e27be166ea85fd9e232f9a29c5aea17fc48d314a5c58
pdf-font-stream PDF embedded font (sfnt) at offset 0x6513 5404 bytes
font_01_sfnt_off00007766.bin
9b98bab4e79cf902e717c5600571345a4accecdb47e9373d273464a1f1528144
pdf-font-stream PDF embedded font (sfnt) at offset 0x7766 10648 bytes
font_02_sfnt_off00009bd3.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9BD3 4324 bytes