Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef847c16bfc4d4a…

MALICIOUS

PDF

77.6 KB Created: 2020-08-11 01:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0c7ca743d8cd217be6dd281fb7d3b9d SHA-1: fcf63801110f0e8869c6893ad97e233b5ad211f0 SHA-256: fef847c16bfc4d4a9cd69572121d9f5b05888bf7404923880fbff63aa0a09fb4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics and the IOCs. The ML classifier strongly flagged this PDF as malicious. The presence of numerous external PDF links suggests a link farm or SEO poisoning 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.cc/pify?keyword=antecedentes+historicos+del+cancer+de+mama+en+mexico+pdf
    • http://riminufe.caprocktrading.com/uploads/1/3/2/3/132303382/wovufotafajilotuxut.pdf
    • http://files.parkheiser.com/uploads/1/3/1/6/131607237/jukabapijafu-dekereto-momegotomodot.pdf
    • http://files.nexusvocalensemble.org/uploads/1/3/0/7/130776208/xobemejokifu_bukuzoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lonub.pdf
    • https://cdn.shopify.com/s/files/1/0435/6977/4750/files/wizobelademu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8330/8955/files/vibeko.pdf
    • https://cdn.shopify.com/s/files/1/0429/9803/8679/files/59512703696.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4939/files/dosinorojexaraxifuw.pdf
    • https://cdn.shopify.com/s/files/1/0437/1480/5914/files/aspects_of_culture_and_society.pdf
    • https://cdn.shopify.com/s/files/1/0431/0119/2352/files/89286745970.pdf
    • https://cdn.shopify.com/s/files/1/0430/0475/6121/files/97703578829.pdf
    • https://cdn.shopify.com/s/files/1/0433/2562/0374/files/62886083383.pdf
    • https://cdn.shopify.com/s/files/1/0431/6623/6826/files/majabefuzamoloke.pdf
    • https://cdn.shopify.com/s/files/1/0433/2827/4587/files/32597776627.pdf
    • https://cdn.shopify.com/s/files/1/0432/9956/9829/files/15217083645.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2797/files/jquery_reload_iframe.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_off0000ee49.bin
8eba4177963acbc9625da6e6b88fe72bf91cd58ad8a5b311111c69242322c615
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE49 5452 bytes
font_01_sfnt_off000100a1.bin
bd260b20a081024e51bc0d9541823c00036f573f972e4ae5c9f6fe17e1155d8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x100A1 11752 bytes