Malicious PDF — malware analysis report

Static analysis result for SHA-256 71573ded4427e23a…

MALICIOUS

PDF

84.8 KB Created: 2020-09-09 12:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 236417f7a156464d3451bbf5d5229fcd SHA-1: ba72d7db6f259091681c94f7f69af7654ca0016b SHA-256: 71573ded4427e23a497baac048c528cc7239b4c4403527cb55751e7aab63f1b7
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=jaundice+newborn+guideline'. It also exhibits characteristics of a PDF link farm, with numerous embedded links. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the presence of a malicious redirector URL within the document body suggests an attempt to lead the user to a malicious site, likely for phishing or further malware delivery.

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.me/wix?keyword=jaundice+newborn+guideline
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/dba42a_80ce02ea208f4033a3c276bf71b5a7d3.pdf
    • https://static.usrfiles.com/ugd/cf79db_73c088f7cd614a318699a8ec1e368edc.pdf
    • https://static.usrfiles.com/ugd/0c41e7_3534a82b2bbf4412b1a780b687b8f471.pdf
    • https://static.usrfiles.com/ugd/22bf55_ead2706d76b7411ebbb024eaa193153b.pdf
    • https://static.usrfiles.com/ugd/7182f3_ff9bfa9360c0491484a9f42d41e4ff6d.pdf
    • https://static.usrfiles.com/ugd/7a13df_27cbfeeb7a1845f2bc38f1a12817e72a.pdf
    • https://static.usrfiles.com/ugd/58a813_62d5103a4880413b8ec91ec874ed33ab.pdf
    • https://cdn.shopify.com/s/files/1/0428/8118/8003/files/saxujo.pdf
    • https://cdn.shopify.com/s/files/1/0428/1905/9868/files/jumokowuzo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7090/5756/files/guranugivujakilaleleseviw.pdf
    • https://cdn.shopify.com/s/files/1/0433/8758/4661/files/lewenulerimivatamax.pdf
    • https://cdn.shopify.com/s/files/1/0434/9899/5864/files/63384698430.pdf
    • https://cdn.shopify.com/s/files/1/0440/3062/3894/files/mofozaxupobotaravubiza.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_off00010c87.bin
7c9d17e7c02601c6e65ace86df5c1eac11439afef88664e630057887d48ea0e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C87 5152 bytes
font_01_sfnt_off00011e2e.bin
d54fecdbc38b5ba818b35a35ae681ed030aa613a51a46df71177ee0b7fc07d72
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2E 12412 bytes