Malicious PDF — malware analysis report

Static analysis result for SHA-256 60d6bc21998fc67c…

MALICIOUS

PDF

103.7 KB Created: 2020-08-15 00:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 045c113fc838773529a5e14a95221bd8 SHA-1: d79873b42c8ba5d1f4fa1c888afe1c208f0ad355 SHA-256: 60d6bc21998fc67ce35b87070acf0418397753abd48b84c5db3869d8abaf379a
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that mirrors the malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing users to the malicious URL for further compromise.

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.com/pify?keyword=pulmonary+arteriovenous+malformation+definition
    • http://files.tooldesignsolutions.com/uploads/1/3/1/8/131856290/laribo.pdf
    • http://wujorepo.pcdeca.com/uploads/1/3/1/6/131606343/8736276.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7720/6178/files/parental_influence_on_academic_performance_of_students.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sogogetuxupoxex.pdf
    • https://cdn.shopify.com/s/files/1/0431/1384/0794/files/convert_to_word_adobe_dc.pdf
    • https://cdn.shopify.com/s/files/1/0432/6028/0992/files/34476098965.pdf
    • https://cdn.shopify.com/s/files/1/0439/5512/6430/files/original_bhagavad_gita_in_english_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32296476761.pdf
    • https://cdn.shopify.com/s/files/1/0435/6148/4437/files/convert_string_to_number_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0428/0942/6079/files/99733727191.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/honda_motorcycle_parts_catalog.pdf
    • https://cdn.shopify.com/s/files/1/0433/9535/0684/files/tofonosepupel.pdf
    • https://cdn.shopify.com/s/files/1/0432/6254/1982/files/nimurefasozas.pdf
    • https://cdn.shopify.com/s/files/1/0431/8088/4129/files/74430891542.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000145ff.bin
0d82cfa77b46b6743dae7687bcc688b29ceb22ef0c89ceaa174fddbd644bc856		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145FF 5216 bytes
font_01_sfnt_off000157b1.bin
31294079d5fdf39f8cef5549d90081ac7075c119604e2f05c8d1ee92252a227b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x157B1 10424 bytes
font_02_sfnt_off00017b79.bin
43dd7310e986e37c0562d6efd2a67b6291a0d41fa892ecd43b306c3e7231f7b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17B79 16148 bytes

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