Malicious PDF — malware analysis report

Static analysis result for SHA-256 6923fe6d4dcfbf54…

MALICIOUS

PDF

71.7 KB Created: 2020-09-05 18:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03087207e0818d16daefe31472ec23c7 SHA-1: 6553dccc412880045c09eccf6b5c702a4dcefd34 SHA-256: 6923fe6d4dcfbf546dee0dabefa1a8604362e439a23b0c20e40e5978a943a6be
162 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with at least one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm strategy. The presence of numerous external PDF links suggests an attempt to manipulate search engine results or redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.me/pify?keyword=aha+guidelines+hypertensive+urgency
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0649/2823/files/39969952153.pdf
    • https://cdn.shopify.com/s/files/1/0431/0804/0853/files/mavelugus.pdf
    • https://cdn.shopify.com/s/files/1/0434/8107/1782/files/naxama.pdf
    • https://static.usrfiles.com/ugd/55f640_9673522d23a84652a5976e0efba2833d.pdf
    • https://cdn.shopify.com/s/files/1/0432/4337/2703/files/how_to_uninstall_world_of_warcraft.pdf
    • https://cdn.shopify.com/s/files/1/0435/2016/3999/files/58308343826.pdf
    • https://cdn.shopify.com/s/files/1/0432/8718/3515/files/2003158866.pdf
    • https://cdn.shopify.com/s/files/1/0429/2454/0071/files/79842573802.pdf
    • https://cdn.shopify.com/s/files/1/0431/0538/6657/files/felelupe.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2485/files/ajax._beginform_upload_file_example.pdf
    • https://cdn.shopify.com/s/files/1/0433/1359/4526/files/reporters_on_cnn.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_off0000d1d6.bin
b6844f1b91bab78dda2e7e3f2e3ac5106a0010e54871f04d988aad42060e19c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D6 5484 bytes
font_01_sfnt_off0000e48e.bin
a5d9247259215c2381f9b85fa631c28d37521d3b2fd7ab0ac73dd7b754ac10b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE48E 14424 bytes