Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d571655b69e213…

MALICIOUS

PDF

45.4 KB Created: 2020-08-29 13:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f715022d8c21f808e329da8f2a6f0f1c SHA-1: e32f205b8af38c7e01672aa02251d7e6213d5c21 SHA-256: 64d571655b69e2137cf87a70e4af71acd2cf41e0a39ad3f9c09cfd376eb4320a
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, a technique often used for SEO poisoning or to host phishing content. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/wix?keyword=using+map+scale+worksheet'. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the embedded URLs and link farm structure suggest a phishing or malicious content distribution attempt.

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=using+map+scale+worksheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_109c11e779594eff83c1b5f4ee0ce557.pdf
    • https://static.usrfiles.com/ugd/b8c837_f00786febb774dfcb39f79a1bc40f0bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e2ceeff3cc145b5b535b7725b6ce195.pdf
    • https://static.usrfiles.com/ugd/b8c837_28f5603e6917447aa94c113b22a1dedb.pdf
    • https://cdn.shopify.com/s/files/1/0430/5892/1621/files/ralesitikumesin.pdf
    • https://cdn.shopify.com/s/files/1/0435/9775/8622/files/anatomy_and_physiology_coloring_workbook_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/9712/0154/files/nixewoli.pdf
    • https://cdn.shopify.com/s/files/1/0435/2117/9802/files/67125648153.pdf
    • https://cdn.shopify.com/s/files/1/0432/7230/6852/files/47096965634.pdf
    • https://cdn.shopify.com/s/files/1/0441/1038/1208/files/advanced_java_jdbc_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0433/6903/7974/files/34627223321.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006597.bin
32c36452ee8df74c964871210e007535ebc938f56b2f8cfa9670af8bb1f3de77
pdf-font-stream PDF embedded font (sfnt) at offset 0x6597 5280 bytes
font_01_sfnt_off00007763.bin
e943a6c1f47e59c67471beded240279feb06e1f5aab0aff1d8a299e49187089d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7763 10412 bytes
font_02_sfnt_off00009b10.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B10 4324 bytes