Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e21530a3bad4eca…

MALICIOUS

PDF

49.2 KB Created: 2020-08-08 05:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ce1ed4ad512b432b0f19ff469da8975 SHA-1: 2d5a109016f86f40b3222324662aa9383ffd1435 SHA-256: 5e21530a3bad4ecad213a03849b34542e2b93b6e29ad625d90f4e6a870a9376c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector identified by heuristics, suggesting an attempt to lure users to malicious sites.

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=harlequins+40k+pdf
    • http://files.elixirespressobar.com/uploads/1/3/0/9/130969545/bapiliwukelifed_rulidaxusin_mowowosajesepis_mogulovopuvo.pdf
    • http://nevij.stjohnsartcamp.com/uploads/1/3/0/9/130969204/5138de.pdf
    • http://files.rireboutique.com/uploads/1/3/0/7/130776542/1230526.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5657/0266/files/44461118294.pdf
    • https://cdn.shopify.com/s/files/1/0430/6622/8898/files/60629648302.pdf
    • https://cdn.shopify.com/s/files/1/0435/6833/2968/files/bach_chaconne_segovia.pdf
    • https://cdn.shopify.com/s/files/1/0432/5202/3458/files/59215319136.pdf
    • https://cdn.shopify.com/s/files/1/0440/7758/0453/files/dental_hygiene_cover_letters.pdf
    • https://cdn.shopify.com/s/files/1/0435/0876/0742/files/14088619008.pdf
    • https://cdn.shopify.com/s/files/1/0433/9325/3526/files/magamikiromuzas.pdf
    • https://cdn.shopify.com/s/files/1/0429/5272/0543/files/98812839833.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/14981909947.pdf
    • https://cdn.shopify.com/s/files/1/0434/1081/7180/files/simple_calculator_java.pdf
    • https://cdn.shopify.com/s/files/1/0428/9275/5111/files/seminopuzezasonupolom.pdf
    • https://cdn.shopify.com/s/files/1/0432/5271/1582/files/94035380793.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_off00008206.bin
88b7e632350a4517c16e07ac16afbc1fdc4b5ad75b65fecfe5a8c16ef6dae317
pdf-font-stream PDF embedded font (sfnt) at offset 0x8206 5416 bytes
font_01_sfnt_off0000947b.bin
0cafc792b80413064f8ebd5587fda089305d1782282ca0cdee0454aeb761d516
pdf-font-stream PDF embedded font (sfnt) at offset 0x947B 10564 bytes