Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1707b1fcb2fc9a…

MALICIOUS

PDF

43.6 KB Created: 2020-08-29 17:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb05bb150c9b6a084ad81f46765b4e14 SHA-1: 2e6e78d6595e6dc6bbd3537479d64cbe1d2eaab4 SHA-256: aa1707b1fcb2fc9ad41d266e07fdc271e2d1c18eb077823c660c426feeeb1a97
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, characteristic of a link farm designed to improve search engine rankings. One of these links, https://ttraff.club/wix?keyword=adobe+after+effects+cc+2017, points to known malicious redirector infrastructure. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious redirector.

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.club/wix?keyword=adobe+after+effects+cc+2017
    • https://cdn.shopify.com/s/files/1/0437/8837/0072/files/sedumijal.pdf
    • https://cdn.shopify.com/s/files/1/0436/1905/7826/files/citroen_c4_2005_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/5524/2655/files/les_articles_definis_indefinis_exercices.pdf
    • https://cdn.shopify.com/s/files/1/0431/6705/6028/files/belt_factory_factorio.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1085/files/sol_u_mel_stain_remover.pdf
    • https://static.usrfiles.com/ugd/89064d_6db080f3f68e4d07850c85bf37244042.pdf
    • https://static.usrfiles.com/ugd/b8c837_fec1fbf942ba4a808d1d1c814c909eef.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8f9b1f3727c49e0a214c508011206bd.pdf
    • https://cdn.shopify.com/s/files/1/0431/7655/8741/files/cvc_words_list_with_pictures_printab.pdf
    • https://cdn.shopify.com/s/files/1/0433/9138/5758/files/examenes_de_formacion_civica_y_etica_secundaria.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bf5.bin
bb8f451268658cb03fa6678e57cee6e9dd20bcca4742456c273a6436f7ae6085		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF5 5516 bytes
font_01_sfnt_off00007ed2.bin
c29682f9c45b43ebbddded8e43b4fdce87649374e62e5f194896aa3f857ebc0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED2 10368 bytes

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