Malicious PDF — malware analysis report

Static analysis result for SHA-256 184c36cf1460df7f…

MALICIOUS

PDF

48.7 KB Created: 2020-08-10 09:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d621b52870ecbe705cfb5ebabeae0353 SHA-1: 4e6a40d1967f202196dac06bdf4f2648aab5b2dd SHA-256: 184c36cf1460df7f129aca03b792a6a706b02d0be0bb13fe1e10aff63d5c0580
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary URL identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the malicious URL and appears to be generated by wkhtmltopdf, a tool often used to create SEO link farms. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is designed to lead users to harmful 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.ru/pify?keyword=catalasa+definicion+pdf
    • http://files.restauranthibiscus.com/uploads/1/3/0/7/130776841/5106130.pdf
    • http://files.chadlutzke.com/uploads/1/3/0/7/130775679/91209f2c.pdf
    • http://files.wilmingtonprintandmail.com/uploads/1/3/1/6/131637057/cd8bc305482.pdf
    • http://files.pommedapidaycare.com/uploads/1/3/1/4/131453615/71f8189.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2640/7833/files/how_to_code_a_game_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0435/5453/7624/files/wezofobofe.pdf
    • https://cdn.shopify.com/s/files/1/0433/8896/0933/files/42128434909.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6744/files/77647440513.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98223768302.pdf
    • https://cdn.shopify.com/s/files/1/0432/2613/6731/files/52336216452.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xasojikunu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4742/0066/files/72842906824.pdf
    • https://cdn.shopify.com/s/files/1/0437/9066/3832/files/microelectronic_circuits_7th_edition_solution_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/6831/8105/files/47675954430.pdf
    • https://cdn.shopify.com/s/files/1/0433/5638/9528/files/fejiladapoze.pdf
    • https://cdn.shopify.com/s/files/1/0427/4677/3660/files/remowatinuvakewup.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_off00007ee9.bin
34105e7c117b7cf3cd4b5885415ce8a441a532eac224914df1a19faf0c418bf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EE9 4960 bytes
font_01_sfnt_off00008fdc.bin
e2869adfbad21693d105205a02a438ec34a47c89375e039fd830afbd4c5398eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FDC 11356 bytes

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