Malicious PDF — malware analysis report

Static analysis result for SHA-256 18cfb41c06b31f97…

MALICIOUS

PDF

40.2 KB Created: 2020-08-12 06:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbc58d9caf45f1326682c7fb101649d9 SHA-1: 13ea35728a5c5f56c913e0238e09e36acd165cdd SHA-256: 18cfb41c06b31f97ccd18f79647a5b09dd9f3b1b8b40264d838503c8bd689b87
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector pointing to 'ttraff.com'. The document body, though partially corrupted, contains text related to a book and the wkhtmltopdf tool, suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion of a malicious redirector or phishing 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.com/wb?keyword=essential%20elements%202000%20book%201%20pdf
    • http://files.tcnazchurch.com/uploads/1/3/2/8/132814990/voxoruxumaripog.pdf
    • http://files.spanish.thelanguagehub.net/uploads/1/3/0/7/130776439/9285612.pdf
    • http://balamajik.msfitch.com/uploads/1/3/1/4/131406082/7726139.pdf
    • http://files.vanaudelanalytix.com/uploads/1/3/0/8/130874587/filebaniremi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6224/8102/files/72701062046.pdf
    • https://cdn.shopify.com/s/files/1/0435/2973/2248/files/lekefarenipigiwugegipim.pdf
    • https://cdn.shopify.com/s/files/1/0433/6674/4216/files/vivuvixevaruvorewedikumu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/31912924056.pdf
    • https://cdn.shopify.com/s/files/1/0437/1713/2456/files/24851697774.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/circle_of_5ths_chart.pdf
    • https://cdn.shopify.com/s/files/1/0429/0550/1852/files/60069057282.pdf
    • https://cdn.shopify.com/s/files/1/0435/7311/7091/files/allan_kardec_evangelho_segundo_o_espiritismo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0703/2990/files/tratamiento_de_amebiasis_intestinal.pdf
    • https://cdn.shopify.com/s/files/1/0428/5923/3443/files/demewuvupanuvewomatodubuj.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_off00005df6.bin
8f7ae641937d54cd7ae63afaa7ee8e117a8b05935c6d4dabca1e4c1c64ec182e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF6 5580 bytes
font_01_sfnt_off000070dc.bin
e3f89aae6e72bcd9067016eaeca44ef098e05bba2243484bf04d2b98a07b6266
pdf-font-stream PDF embedded font (sfnt) at offset 0x70DC 10196 bytes