Malicious PDF — malware analysis report

Static analysis result for SHA-256 13105e26bc356d27…

MALICIOUS

PDF

46.0 KB Created: 2020-08-31 03:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e56faef82542ffceb171eea43ae46274 SHA-1: 5d10608c74767920b3effa22b54dfd2d81ae6561 SHA-256: 13105e26bc356d274e8cc8f0027291b29e3bea57e1c75ae976d3d213e5318bc7
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one identified as a known malicious redirector. The file also functions as a link farm, distributing links to 28 other PDF documents, suggesting an attempt to obscure malicious activity or distribute further content. While no scripts were directly extracted, the presence of embedded URLs and the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic indicate a high likelihood of malicious redirection.

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/wix?keyword=%25D1%2581%25D0%25BA%25D0%25B0%25D1%2587%25D0%25B0%25D1%2582%25D1%258C+%25D1%2581%25D0%25B0%25D0%25B8+%25D1%2581%25D0%25BE+%25D0%25B2%25D1%2581%25D0%25B5%25D0%25BC%25D0%25B8+%25D0%25BA%25D0%25B8%25D1%2581%25D1%2582%25D1%258F%25D0%25BC%25D0%25B8+%25D0%25B1%25D0%25B5%25D0%25B7+%25D1%2582%25D1%2580%25D0%25B8
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/8959/2473/files/ligue_total_midnight_cowboy.pdf
    • https://cdn.shopify.com/s/files/1/0463/2500/6497/files/gamabifojop.pdf
    • https://cdn.shopify.com/s/files/1/0436/9252/3675/files/el_camino_del_artista_completo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8441/5143/files/48421852099.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wajumibuxup.pdf
    • https://static.usrfiles.com/ugd/b8c837_5404fdac63b843aea2ad5f52b0b64019.pdf
    • https://static.usrfiles.com/ugd/b8c837_54a8aafbb542419fa5888ecb6c672759.pdf
    • https://static.usrfiles.com/ugd/909b15_1565e1d69dc44d87909a44298a7ff647.pdf
    • https://cdn.shopify.com/s/files/1/0430/8166/2628/files/53987275525.pdf
    • https://cdn.shopify.com/s/files/1/0436/9140/9561/files/you_covered_me_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0430/0318/3258/files/dd_form_2278.pdf
    • https://cdn.shopify.com/s/files/1/0439/4621/3544/files/estimating_costing_civil_engineering.pdf
    • https://static.usrfiles.com/ugd/234f58_ac6459a8b87e469fbf326806db96f137.pdf
    • https://static.usrfiles.com/ugd/2813e2_5a00c9c04131488793aaf18cfefefda8.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005aaf.bin
7b2083cbcb7d953d5e216b3ec82e544ddb6220156711c454abf6e97bed9da4eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AAF 5232 bytes
font_01_sfnt_off00006cb4.bin
f73f550631163caa74fa756168290691b971fc2a9103cc4a52a804c36cf6e000		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CB4 14580 bytes
font_02_sfnt_off00009a2b.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A2B 4324 bytes

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