Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a99c6a5128afd4…

MALICIOUS

PDF

54.0 KB Created: 2020-08-21 03:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efead7b16458d6491029bde8aac02135 SHA-1: e824ef9fca7afcf22d7c84705e008b147a88f259 SHA-256: e3a99c6a5128afd47e448c02dcd9560a4ec182fa94e19a2c7a9e27481335b903
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to contain the same malicious URL. The presence of numerous external links, including a redirector, suggests a link farm or redirection attack designed to lead users to malicious 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.com/pify?keyword=helicobacter+pylori+tratamiento+pdf
    • http://mazumun.1897avz.com/uploads/1/3/0/7/130740178/787590.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4447/files/area_of_trapezoid_worksheet_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0435/9582/5320/files/37940091712.pdf
    • https://cdn.shopify.com/s/files/1/0428/6955/5356/files/watch_21_jump_street_online.pdf
    • https://cdn.shopify.com/s/files/1/0438/1969/6290/files/importancia_de_las_bacterias_nitrificantes.pdf
    • https://cdn.shopify.com/s/files/1/0434/9558/8002/files/gudov.pdf
    • https://cdn.shopify.com/s/files/1/0428/0880/3495/files/71191118345.pdf
    • https://cdn.shopify.com/s/files/1/0438/2484/0861/files/36781220614.pdf
    • https://cdn.shopify.com/s/files/1/0437/1746/0120/files/detetajapor.pdf
    • https://cdn.shopify.com/s/files/1/0428/2076/3804/files/dufunowopovesibajotozuvo.pdf
    • https://medlineplus.gov/helicobacterpyloriinfections.html
    • 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_off000094c8.bin
5bd0abdb271d3d7023b99e6bed00d8c661e3838713cce27884510795b21bb81b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94C8 5328 bytes
font_01_sfnt_off0000a6ca.bin
19e9aa3710cf6e46f2651ad2082221280e775dcd3b8e50f05981c3867202c50c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6CA 10792 bytes

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