Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5e3b72087ca70a…

MALICIOUS

PDF

51.4 KB Created: 2020-08-09 10:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 410ce42cb9edd513ced62f2977b37c45 SHA-1: e120ec49956127747f0aed91630cfcdb87474eca SHA-256: 5f5e3b72087ca70a1d682273926059b68d280d002d1cc59bfa7ba6749dae6856
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of this redirection scheme. The presence of a link farm and the ML classifier's high confidence score indicate a malicious intent to direct users to harmful content.

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/pify?keyword=car+chassis+design+pdf
    • http://files.juiceboxventures.com/uploads/1/3/1/6/131637853/juvifexefodupar.pdf
    • http://files.naturalbiblicalhealth.com/uploads/1/3/0/7/130739202/ce53c637cfa.pdf
    • http://files.ivnonline.info/uploads/1/3/1/4/131408581/guzenojol_xazal_vavopi.pdf
    • http://files.georgiarugbyunion.org/uploads/1/3/1/6/131637226/devowa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9845/4693/files/maworevudu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5197/3799/files/chemistry_diagnostic_test.pdf
    • https://cdn.shopify.com/s/files/1/0429/6350/1222/files/46163076101.pdf
    • https://cdn.shopify.com/s/files/1/0428/6559/0438/files/dibiwuketimunowu.pdf
    • https://cdn.shopify.com/s/files/1/0444/4851/4215/files/cayley_hamilton_theorem_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/3185/4247/files/92242823990.pdf
    • https://cdn.shopify.com/s/files/1/0435/2140/9184/files/60793630749.pdf
    • https://cdn.shopify.com/s/files/1/0434/0652/4583/files/medical_rep_cv.pdf
    • https://cdn.shopify.com/s/files/1/0430/7560/0535/files/nafupipizekavosuzobetigal.pdf
    • https://cdn.shopify.com/s/files/1/0431/6758/0317/files/rivofikoxupos.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_off0000895c.bin
f4cd1549c2d3ddfe65279ef98418e48000e58d6bfe3d94855b69ebc7fd57132a
pdf-font-stream PDF embedded font (sfnt) at offset 0x895C 5292 bytes
font_01_sfnt_off00009b56.bin
e5addbecc4547ef5779739eda453f0eaa775854abf633c112f8ed403c4591212
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B56 11520 bytes