Malicious PDF — malware analysis report

Static analysis result for SHA-256 76281626dfcca4be…

MALICIOUS

PDF

35.8 KB Created: 2020-08-31 14:39:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0809f0ceaa0378ed2bd4f00d78704862 SHA-1: 95cbc2c2e4d6922efc52a2ebc4ed1320c3c4de71 SHA-256: 76281626dfcca4be2c55fe53573ec7956168fde08c99f68414febde7298a9052
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify and other platforms, forming a link farm. One of these links, https://ttraff.com/wix?keyword=notes+on+fireworks+worksheet+2+answers, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. No scripts were extracted from this sample.

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.com/wix?keyword=notes+on+fireworks+worksheet+2+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4361/7958/files/moriencia_augusto_roa_bastos.pdf
    • https://cdn.shopify.com/s/files/1/0429/8378/4601/files/ever_be_bethel_chords.pdf
    • https://cdn.shopify.com/s/files/1/0436/5778/9593/files/fortnite_newsela_answers.pdf
    • https://static.usrfiles.com/ugd/3aca14_69eda0a6fbb8435ea2d7a6c31c33b419.pdf
    • https://static.usrfiles.com/ugd/f84671_a320df65966742eb9666737ece2ac6d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_8298f1fa6bdb441c93f0ece271c65248.pdf
    • https://static.usrfiles.com/ugd/f46427_02f5d957a20f44a3b32be44c72097691.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/49881996605.pdf
    • https://cdn.shopify.com/s/files/1/0436/0906/3582/files/11895302143.pdf
    • https://cdn.shopify.com/s/files/1/0440/7423/8102/files/natejen.pdf
    • https://cdn.shopify.com/s/files/1/0432/5811/8312/files/bitlocker_password_recovery_software_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/4926/3004/files/mozufozozi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/pifiremarimupolikumo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2429/3796/files/5052189084.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_off00004f75.bin
25c88730ecda14c4f004e216203d0516e884dae3b12fe3be8e5e5948f654b5e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F75 5080 bytes
font_01_sfnt_off000060d3.bin
21f063d5bcaca832886d59f2a15e362966229c06c3e7a8cfcc327a764eb0ab3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x60D3 10172 bytes