Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bac280432fd2c04…

MALICIOUS

PDF

46.0 KB Created: 2020-09-04 19:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed6b8001aba1efc0519f06ac044f0cb1 SHA-1: 214a3d5a415d0f79badcc8c87a722f894584c0c8 SHA-256: 5bac280432fd2c04c7db2b3b26f31b1f0eec3b0233e8642fa090b109506aa06f
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure the user to a malicious site. The presence of numerous other PDF links, many of which are benign, may be an attempt to blend in or to create a link farm for SEO poisoning.

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=converting+metric+units+worksheet+with+answers+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/8b49c6_836780ae2fab449fa77c2e434f06bd57.pdf
    • https://static.usrfiles.com/ugd/270e53_104788f4e8d141c8a3738c904b719932.pdf
    • https://static.usrfiles.com/ugd/b8c837_b01fc56c381f4779bf5c7aad3101d6d4.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3798/files/linking_verbs_worksheet_for_grade_6.pdf
    • https://cdn.shopify.com/s/files/1/0434/9270/4408/files/37771817626.pdf
    • https://cdn.shopify.com/s/files/1/0430/4879/6309/files/mevevexuwiwimuregegukim.pdf
    • https://cdn.shopify.com/s/files/1/0433/1044/8798/files/sopa_de_letras_para_adultos_para_imp.pdf
    • https://cdn.shopify.com/s/files/1/0437/2666/7925/files/36931118972.pdf
    • https://cdn.shopify.com/s/files/1/0436/0998/1085/files/renojakonavur.pdf
    • https://cdn.shopify.com/s/files/1/0433/8250/5628/files/kixelabo.pdf
    • https://static.usrfiles.com/ugd/469aea_aa113770958e4315937eaafed30232a1.pdf
    • https://static.usrfiles.com/ugd/55f640_686167e8eacf4b9a9920943aecfb3e91.pdf
    • https://static.usrfiles.com/ugd/b0cb2d_64e4501c93414859b3a4c4f65de187f8.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_off000072f0.bin
cde8fba34d0a3b87fe00fd2d0fd25559b95b86cef192ea7e8f609c384c009b92
pdf-font-stream PDF embedded font (sfnt) at offset 0x72F0 5660 bytes
font_01_sfnt_off00008622.bin
67a9d0bfdf1112c67185d928d05fa0e52bb040903e5c37fed4288379a1f28f26
pdf-font-stream PDF embedded font (sfnt) at offset 0x8622 10740 bytes