Malicious PDF — malware analysis report

Static analysis result for SHA-256 7abc626c18050b39…

MALICIOUS

PDF

39.7 KB Created: 2020-09-02 13:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80cc233eb5cd9dcedd6910de2f06a4bd SHA-1: 3b225127d8202a99b7a36e7c440fddb7b324c1a9 SHA-256: 7abc626c18050b39446c59c0c870f93974738aae91f800e008d44d30bbe9bb92
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with 15 external PDF links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL. The ML classifier strongly indicates maliciousness, supporting the attack pattern of luring users to malicious infrastructure.

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.link/wix?keyword=body+linen+massage+table+sheets
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4501/1112/files/sp2_hybridisation_chem_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/3898/8709/files/25165761642.pdf
    • https://cdn.shopify.com/s/files/1/0435/0096/1947/files/89252082409.pdf
    • https://cdn.shopify.com/s/files/1/0430/4578/1665/files/79353447420.pdf
    • https://cdn.shopify.com/s/files/1/0429/3292/8671/files/8781551021.pdf
    • https://cdn.shopify.com/s/files/1/0457/3636/2140/files/motorized_barn_door_tracker.pdf
    • https://cdn.shopify.com/s/files/1/0431/6345/1560/files/86140280783.pdf
    • https://cdn.shopify.com/s/files/1/0437/9482/5376/files/69693751415.pdf
    • https://static.usrfiles.com/ugd/cb5dea_409669661a154dbb9f7770857e9eb99b.pdf
    • https://static.usrfiles.com/ugd/b8c837_a90dd225c32e41e8af431106ff17fda3.pdf
    • https://cdn.shopify.com/s/files/1/0434/4276/5976/files/fozilola.pdf
    • https://cdn.shopify.com/s/files/1/0436/1663/2994/files/spoken_english_lessons_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0439/3838/1992/files/jabafibogeno.pdf
    • https://cdn.shopify.com/s/files/1/0437/2935/4906/files/definition_of_numerical_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0465/5788/8662/files/78916068009.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_off00005cdf.bin
30f24e7b99344faf1e55d2fe5f48facf1e4abf566107657cd5189177a4d12ecb
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CDF 5432 bytes
font_01_sfnt_off00006f39.bin
9c7d16ef7ebbf5cbceee33d391c7543d491b8dc19d9d19df8fc8652175eab2bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F39 10212 bytes