Malicious PDF — malware analysis report

Static analysis result for SHA-256 791241b2138acffb…

MALICIOUS

PDF

39.2 KB Created: 2020-08-31 03:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83434e19c3419d29f0c100e6effe6d88 SHA-1: a740f8f6f9cc0451cac32a11eb4db9d22ebd31b0 SHA-256: 791241b2138acffb172036e35b7e818257b91d8d83882c11a1a32e64f8836610
154 Risk Score

Malware Insights

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

This PDF document contains embedded links that lead to a redirector infrastructure, identified as malicious. The document body suggests a lure related to sheet music, likely to entice users to click the malicious link. The presence of numerous external PDF links further indicates a link farm, a common tactic for SEO poisoning or distributing malicious content.

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=there+you%2527+ll+be+sheet+music
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5152/4008/files/12474413692.pdf
    • https://cdn.shopify.com/s/files/1/0434/4093/0968/files/jexulutukazet.pdf
    • https://cdn.shopify.com/s/files/1/0461/6463/9896/files/5349423586.pdf
    • https://cdn.shopify.com/s/files/1/0439/3415/4907/files/exercice_amortissement_dgressif_avec_corrig.pdf
    • https://cdn.shopify.com/s/files/1/0431/0886/0065/files/whatsapp_for_android_2._2._3.pdf
    • https://cdn.shopify.com/s/files/1/0434/8212/0357/files/99905796059.pdf
    • https://static.usrfiles.com/ugd/e6092c_07fefb1ce01a4a0fb3a038a0f83e62e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_74fa95b602744448aa61b1252f47909b.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ff32f78a12449649dd687e530b692e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_8895a66aa5e94c0aa5629c65ffb013c7.pdf
    • https://static.usrfiles.com/ugd/b47706_e3470f2427d9462f97535cbbb985c44c.pdf
    • https://static.usrfiles.com/ugd/5be868_2ca86cb9d8a3411ba93099cb17cda5de.pdf
    • https://static.usrfiles.com/ugd/6cf392_89f93b5e126d460089e0b87b67d6d0fa.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_off000053c4.bin
226f40d98642e629ba28fec1c09d7a5e5404cfb00107f6f3739f25616573695d
pdf-font-stream PDF embedded font (sfnt) at offset 0x53C4 5052 bytes
font_01_sfnt_off000064e3.bin
04acd0ba059e0fbec63abb75e2edcf593a47140c8d328ae465143edf815f5ad3
pdf-font-stream PDF embedded font (sfnt) at offset 0x64E3 13564 bytes