Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9fedf011b842d5…

MALICIOUS

PDF

37.0 KB Created: 2020-08-12 04:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55bf8b24c44beb7eec45419275b5e842 SHA-1: b960c189e57714b77470da59fb774e46f025e473 SHA-256: 4b9fedf011b842d5c546fa5284241b888e89d31c4a5afeec8c66925cb3616999
120 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to textbooks and includes the malicious URL. This suggests a phishing or social engineering attack aiming to redirect users to malicious infrastructure.

Heuristics 3

  • 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.
  • 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=algebra+2+trigonometry+textbook+mcdougal+littell+pdf
    • http://files.grcrowfamily.com/uploads/1/3/1/0/131070190/3426f7e.pdf
    • http://mubovimux.istemeducation.com/uploads/1/3/1/1/131163763/6914879.pdf
    • http://files.movehelix.com/uploads/1/3/1/4/131483025/775146619.pdf
    • http://files.mypromobook.com/uploads/1/3/1/3/131381602/jazafovu_saberufuvatol_vebijarudigez.pdf
    • https://cdn.shopify.com/s/files/1/0432/8669/1998/files/95196475855.pdf
    • https://cdn.shopify.com/s/files/1/0434/9588/2918/files/laporan_pendahuluan_hernia_inguinal.pdf
    • https://cdn.shopify.com/s/files/1/0437/1765/6731/files/lowes_warrensburg_mo.pdf
    • https://cdn.shopify.com/s/files/1/0439/8468/3166/files/lawejaforofipa.pdf
    • https://cdn.shopify.com/s/files/1/0438/2353/0141/files/13073567979.pdf
    • https://cdn.shopify.com/s/files/1/0437/2001/6021/files/95795158576.pdf
    • https://cdn.shopify.com/s/files/1/0435/8343/9003/files/pirates_of_the_caribbean_easy_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/82560768394.pdf
    • https://cdn.shopify.com/s/files/1/0436/3137/8590/files/55314676061.pdf
    • https://cdn.shopify.com/s/files/1/0431/9733/3664/files/pafezaxuvenamofi.pdf
    • https://cdn.shopify.com/s/files/1/0437/0549/9803/files/95927664163.pdf
    • https://cdn.shopify.com/s/files/1/0438/1986/0125/files/diferencia_entre_anestesia_raquidea_y_epidural.pdf
    • https://cdn.shopify.com/s/files/1/0437/8548/6498/files/kebisoxavo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3202/6008/files/agenda_2020_imprimir.pdf
    • https://cdn.shopify.com/s/files/1/0431/0453/4692/files/30473844290.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_off00005124.bin
d8289350220343bbd8fdcf7dce495e501cc6fbb832a1082583014743e27f1316
pdf-font-stream PDF embedded font (sfnt) at offset 0x5124 5792 bytes
font_01_sfnt_off000064cf.bin
5e6b6f93f215d2b77c08f7532764209732e89728cf1a786a48568cff03186cfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x64CF 9912 bytes