Malicious PDF — malware analysis report

Static analysis result for SHA-256 d96b96ff14f0a716…

MALICIOUS

PDF

40.1 KB Created: 2020-08-09 11:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e7a9655edfb777edf28685ea6b9612f SHA-1: 5e23cd8407254b4bddf144df4f61ae0a9688cdad SHA-256: d96b96ff14f0a7163bfdef52fc78891d33389acd05d23899e4b3f89e010cfa2d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The presence of numerous links, including one pointing to a known malicious redirector, suggests an attempt to lure users to malicious sites. The document body text is heavily obfuscated and contains references to the malicious URL and other embedded links.

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=o+alienista+pdf+gratis
    • http://files.rubiniart.com/uploads/1/3/1/3/131382092/wufakomigebajik-nagudukodisosaz-kosipuvuno.pdf
    • http://files.berkshirepsych.com/uploads/1/3/0/8/130874257/736341b39b1c.pdf
    • http://files.centrecollegialalberta.com/uploads/1/3/1/3/131380177/6114809.pdf
    • http://files.cfbcyouth.org/uploads/1/3/0/9/130969907/fe672d93ed.pdf
    • https://cdn.shopify.com/s/files/1/0429/8647/1587/files/fekujuri.pdf
    • https://cdn.shopify.com/s/files/1/0434/1691/2037/files/98159668318.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0660/files/23093439289.pdf
    • https://cdn.shopify.com/s/files/1/0431/4864/0418/files/warabavetodomosobezog.pdf
    • https://cdn.shopify.com/s/files/1/0431/6472/9512/files/gabalawufime.pdf
    • https://cdn.shopify.com/s/files/1/0431/9939/8052/files/jumaveruzogiposinuwob.pdf
    • https://cdn.shopify.com/s/files/1/0437/3594/1274/files/62185895339.pdf
    • https://cdn.shopify.com/s/files/1/0430/8379/2545/files/linebidezup.pdf
    • https://cdn.shopify.com/s/files/1/0431/5552/1700/files/centrally_acting_skeletal_muscle_relaxants.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67572949107.pdf
    • https://cdn.shopify.com/s/files/1/0436/1755/0499/files/bemetunug.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d30.bin
9c7f56f3368ba13a5b23700bcecee1bd0929a6a6da9cc98ef452750f60349e32
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D30 5236 bytes
font_01_sfnt_off00006f0e.bin
38188f2612867228bf3492678197c7817920efdfc9c37ef7dc4827d3c56b8af4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F0E 10272 bytes