Malicious PDF — malware analysis report

Static analysis result for SHA-256 8724cda9c9c47433…

MALICIOUS

PDF

34.3 KB Created: 2020-08-22 13:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86394fbd8eefffe9f2dd3c43d5c2ead4 SHA-1: 43abf2be61403821edbd9ad44278048a6e7ef8f5 SHA-256: 8724cda9c9c47433a988b2c5a57000f08a6a51a552e542e1979ee68505d7b13b
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure, directing users to a malicious redirector. This suggests a phishing or malware distribution attempt.

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=platform+9+3%252F+4+womens+shirt
    • http://files.contemporaryaffordableinsurance.com/uploads/1/3/2/6/132681477/7802991.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7131/5876/files/tikodenidodixevu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5201/4495/files/39603273293.pdf
    • https://cdn.shopify.com/s/files/1/0441/2666/6904/files/java_7._2_32_bit.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/nuwusomulanifiju.pdf
    • https://cdn.shopify.com/s/files/1/0434/2333/4565/files/rodomebepovuzogitamebof.pdf
    • https://cdn.shopify.com/s/files/1/0430/0141/3785/files/busezarexix.pdf
    • https://cdn.shopify.com/s/files/1/0461/3170/8072/files/1366277886.pdf
    • https://cdn.shopify.com/s/files/1/0432/9173/8277/files/duvalodimutilinabu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4955/7917/files/cardiopatia_de_takotsubo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5469/files/47725678086.pdf
    • https://cdn.shopify.com/s/files/1/0437/1149/6347/files/lafijipa.pdf
    • https://cdn.shopify.com/s/files/1/0427/7927/9527/files/zabozej.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_off00004815.bin
9a7efd774eb07bbb6d9c9bf1496cbe1b1c5320f29c41ba401985b3f5c1f1d9a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x4815 5544 bytes
font_01_sfnt_off00005ad4.bin
0aec2983fd8d0ba55005203b852966c5a420f64355520f78bd8118b88d8757d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AD4 9804 bytes