Malicious PDF — malware analysis report

Static analysis result for SHA-256 139a4472e8451c47…

MALICIOUS

PDF

42.1 KB Created: 2020-08-08 13:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93783d12bcfb6b6481dc52581f19c971 SHA-1: e0921a5ade092f485d6cec79be4caf43e7ee1008 SHA-256: 139a4472e8451c476c41083d72e95a1bb674db98eccb1a35fab1643c301adad1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL designed to lure users with a keyword search for 'convert pdf to dwg online zamzar'. The ML classifier strongly indicates maliciousness, and the presence of numerous external links, many pointing to potentially malicious or unknown domains, supports the classification as a link farm used for malicious redirection. The document body, though heavily obfuscated, contains the primary malicious URL.

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.ru/pify?keyword=convert+pdf+to+dwg+online+zamzar
    • http://gezumala.joxytales.com/uploads/1/3/1/3/131398222/6cbccb0.pdf
    • http://gikeru.ckrmleadership.com/uploads/1/3/2/8/132815367/e8ed35.pdf
    • http://files.findyourcenterpasco.com/uploads/1/3/2/6/132695818/4727739.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/8298/7158/files/48864606933.pdf
    • https://cdn.shopify.com/s/files/1/0437/9816/7713/files/the_boundary_element_method_for_engineers_and_scientists.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12091312038.pdf
    • https://cdn.shopify.com/s/files/1/0437/2758/5445/files/53869482212.pdf
    • https://cdn.shopify.com/s/files/1/0429/6327/1833/files/rojezalewamavisab.pdf
    • https://cdn.shopify.com/s/files/1/0447/1750/6716/files/alter_ego_plus_3_cahier_d_activits_corrige.pdf
    • https://cdn.shopify.com/s/files/1/0428/5654/6467/files/sosusedagumarubazuvid.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/98177162151.pdf
    • https://cdn.shopify.com/s/files/1/0432/0047/9391/files/kewexuve.pdf
    • https://cdn.shopify.com/s/files/1/0432/2613/6743/files/ruwuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/chemistry_placement_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/5768/4385/files/20373635232.pdf
    • https://cdn.shopify.com/s/files/1/0428/7604/3423/files/80782918805.pdf
    • https://cdn.shopify.com/s/files/1/0435/1868/9432/files/xokovodogag.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_off000066ac.bin
be20fd955d336eeb02262a719e42f03f94a405547ff97c6ca9755375def4b33c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66AC 5292 bytes
font_01_sfnt_off000078b8.bin
bc8949e352454203238a4fafa49e980ae9b4c41be1b2f534b8cefde03bdd990f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78B8 10148 bytes

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