Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae94ff5657e83a93…

MALICIOUS

PDF

41.5 KB Created: 2020-08-30 09:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d253a031b4ba612beb9a51e047d47979 SHA-1: c6ed5b6b4ec7da62ce9cfe8aa68725d01778d319 SHA-256: ae94ff5657e83a937726925670707760c1a0f7070d50fd5f2370f4b0349a390c
152 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=abrindo+consci%25C3%25AAncia+espiritualmente'. It also exhibits characteristics of a PDF link farm, embedding a large number of external links, many of which resolve to benign Shopify domains but are likely used to obscure the malicious redirector. The ML classifier strongly indicates maliciousness.

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.cc/wix?keyword=abrindo+consci%25C3%25AAncia+espiritualmente
    • https://cdn.shopify.com/s/files/1/0432/5300/6494/files/bafegan.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8273/files/fuvivexojasatovoza.pdf
    • https://cdn.shopify.com/s/files/1/0437/6998/7223/files/silekisasurexanonolud.pdf
    • https://cdn.shopify.com/s/files/1/0432/0333/0209/files/aprender_ingles_para_nios_de_3_a_5_aos.pdf
    • https://static.usrfiles.com/ugd/b8c837_13c88426f0d94e63b2eba14d524863fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_bedd8e080bf247bbb2d10ff3f6795f97.pdf
    • https://static.usrfiles.com/ugd/271e65_e3376cb5c7264c30a041f03147c08023.pdf
    • https://static.usrfiles.com/ugd/b8c837_f52ec25b35d0407d8f27524e9b91a89d.pdf
    • https://static.usrfiles.com/ugd/89c6ad_fefe9665fd854b3eb639d69dd7896ba1.pdf
    • https://static.usrfiles.com/ugd/21e6f2_e81329ca3943447e81754a46974c9efd.pdf
    • https://static.usrfiles.com/ugd/c3f88d_c59803d69a6d43be841b510c337294d6.pdf
    • https://static.usrfiles.com/ugd/eb4c03_7daceb1575804948af29fc0ca3806016.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f92117751674146a6ad2d0bfaccd715.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_off00005ffb.bin
ab58dcb16b6d2fbff783fce39a94a23f276e7b9ad2898d4cc78a136318b5745c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FFB 5500 bytes
font_01_sfnt_off00007245.bin
5e188fafe2aac309d439e4425a09f68512d8dac959847814daa87a03b666a73e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7245 12216 bytes