Malicious PDF — malware analysis report

Static analysis result for SHA-256 1638e95e5a4745e5…

MALICIOUS

PDF

35.8 KB Created: 2020-08-31 22:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 066927280bf6485584736872c8907961 SHA-1: a857c06accd241281e3d2924880e63167f5d9606 SHA-256: 1638e95e5a4745e5308415b970440ba66f33bd2ab30429d78e10f605c58bf84e
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.cc/wix?keyword=certificado+de+nacimiento+mexico+pdf'. The document body, though heavily obfuscated, appears to contain this URL and other links, suggesting a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector indicates an attempt to lead the user to a harmful site.

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=certificado+de+nacimiento+mexico+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/0027/2792/files/sims_3_male_hair_cc.pdf
    • https://cdn.shopify.com/s/files/1/0431/5486/6333/files/40210178568.pdf
    • https://cdn.shopify.com/s/files/1/0429/7120/1695/files/77173131766.pdf
    • https://static.usrfiles.com/ugd/b8c837_affe1b30498c467f87c4f69187cf9570.pdf
    • https://static.usrfiles.com/ugd/88a84f_03dfe46aaeb543e1a7e4ed7e88144181.pdf
    • https://static.usrfiles.com/ugd/f0e51d_93285271c3b34767b5329bcaf6a06a5d.pdf
    • https://static.usrfiles.com/ugd/f7fbc8_1dedbf108e8e48beafa0d76a6584f7fb.pdf
    • https://static.usrfiles.com/ugd/ba3095_0382805b83604f75817c58410b412cc4.pdf
    • https://cdn.shopify.com/s/files/1/0433/7981/8661/files/facturacion_cfdi_gm_modelo_gmodelo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2574/4547/files/wosiragujopodu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9940/5977/files/60658066115.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80463449019.pdf
    • https://cdn.shopify.com/s/files/1/0431/0050/4217/files/convert_vmdk_to_vhdx.pdf
    • https://cdn.shopify.com/s/files/1/0433/4508/4574/files/govitetibi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4295/4661/files/lodusaliwavowifesepaz.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_off00004ce3.bin
9ca545cd9041a40c256dfe3b98239a9286b2a3c0ac156936249c3f46360ae179
pdf-font-stream PDF embedded font (sfnt) at offset 0x4CE3 5064 bytes
font_01_sfnt_off00005e09.bin
eeca89b44d950db891cbcf338f767e1f9457b6a321213d414e5430cfb4c4ea47
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E09 10684 bytes