Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c4b80094ea275a…

MALICIOUS

PDF

62.3 KB Created: 2020-09-03 00:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46fd10687aec3b89dadcd511e47ae0f1 SHA-1: 2f3747a09c9acc52fa05097f607c5acec4461af1 SHA-256: 09c4b80094ea275a4b50012007d64c4d19313901fabbdbfa153457f9d763dd02
154 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a malicious redirector, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic firing. It contains a link farm with numerous external PDF links, with the primary suspicious URL being 'https://ttraff.cc/wix?keyword=child+protection+reporting+procedures+nsw'. This suggests an attempt to lure users to malicious sites, likely for phishing or malware delivery. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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=child+protection+reporting+procedures+nsw
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/dd6616_7219edc4e0714f39ae0294c695355acd.pdf
    • https://static.usrfiles.com/ugd/04e6f9_da590815f1ad433b87a7b7ee6c83e800.pdf
    • https://static.usrfiles.com/ugd/35c6e2_c05395e742b14592afa4cb4e1edeca54.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/49118620120.pdf
    • https://cdn.shopify.com/s/files/1/0428/4026/0775/files/64274644274.pdf
    • https://cdn.shopify.com/s/files/1/0429/6887/5157/files/besatetaxivanenuxa.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2328/files/dijokebifitubusematoke.pdf
    • https://cdn.shopify.com/s/files/1/0441/0467/9576/files/complaint_affidavit_template.pdf
    • https://static.usrfiles.com/ugd/50c35f_5871999a09a0401a87d3274b3ac2a118.pdf
    • https://static.usrfiles.com/ugd/c3f88d_0892d07571ea440984044113f11527f9.pdf
    • https://cdn.shopify.com/s/files/1/0432/8475/8696/files/sedabipavenafivorimaxavij.pdf
    • https://cdn.shopify.com/s/files/1/0431/1089/1680/files/62986969942.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_off0000b7c1.bin
83cf8593131694e8b98a9730de6700e2f5efb1cf8bc4515847c6e7b0771f2e03
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C1 5124 bytes
font_01_sfnt_off0000c936.bin
85b91e01e2579e72c0382da689f1939abacf2b0e41f48db8ef4ebdcc75742870
pdf-font-stream PDF embedded font (sfnt) at offset 0xC936 10292 bytes