Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a50143074eb225e…

MALICIOUS

PDF

33.3 KB Created: 2020-08-31 06:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a8358a072ae31d08f2f3065f5867665 SHA-1: 0c2d2993be9379e6b5a48edd2c4e667c84aa085f SHA-256: 6a50143074eb225e9244bdce312e38d1ae42bdd3506cb25bb27e6be3341a5a02
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many pointing to external PDF files, which is indicative of a link farm or SEO manipulation tactic. One of the embedded URLs, https://ttraff.com/wix?keyword=fitxes+catala+2n+primaria+per+imprimir, is flagged as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the embedded links and the redirector suggest an attempt to lure users to malicious content, likely as part of a phishing or malware distribution scheme.

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/wix?keyword=fitxes+catala+2n+primaria+per+imprimir
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_c600590d24314c688e96f21fb110b748.pdf
    • https://static.usrfiles.com/ugd/de65f7_493206a8c6ba46ca8f83965cad10dc6a.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b344450f25b49bf95e1d2fa05b85f01.pdf
    • https://static.usrfiles.com/ugd/fb5067_b2c43615a8cc4295b00e02603ed7d351.pdf
    • https://cdn.shopify.com/s/files/1/0434/5197/3794/files/76811154567.pdf
    • https://cdn.shopify.com/s/files/1/0432/6762/1028/files/saxubibatolo.pdf
    • https://cdn.shopify.com/s/files/1/0436/6699/7398/files/skyrim_special_edition_unp_textures_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/8322/5506/files/52257163964.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/19922874993.pdf
    • https://static.usrfiles.com/ugd/b8c837_66982b67d4c2464abc877d2469cd7e2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_67a5ee8dde504dfd8d09119a4d987df7.pdf
    • https://static.usrfiles.com/ugd/1df9ea_92db8778b538470b82c156ef48eb41c0.pdf
    • https://static.usrfiles.com/ugd/89064d_00542ea2252340a4b491aec5c76b85bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_58411345d1bd491490161519b197cc46.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_off00004488.bin
98c86803ad491d86dec9c7a37281c378ae27e4f0dc796d0b73814af4dbf89114		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4488 5232 bytes
font_01_sfnt_off0000563c.bin
8d3dee8c504fc13db8603f3195fc0ef71d912b958856623a6da2d7e733b582b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x563C 10160 bytes

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