Malicious PDF — malware analysis report

Static analysis result for SHA-256 a409a2606cd2ec30…

MALICIOUS

PDF

45.0 KB Created: 2020-08-08 00:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d141c72ede1ce602a07218ece68ea41d SHA-1: 0385607a97e172d46831c9df2e136ce0e9e97ae7 SHA-256: a409a2606cd2ec30be6b9d02a6163eeafe7be2a5c70d677f445cee2be7829c9f
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to its inclusion of a link farm pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are part of this link farm, including a primary redirector URL. This suggests the PDF's purpose is to lure users to malicious sites.

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=equality+and+diversity+policy+pdf
    • http://memadej.ulistore.com/uploads/1/3/0/8/130814297/a86339883c83.pdf
    • http://files.heroandprincessparties.com/uploads/1/3/0/7/130775245/024e6861da.pdf
    • http://files.cortlippe.com/uploads/1/3/1/0/131070678/5001702.pdf
    • https://cdn.shopify.com/s/files/1/0429/4731/3827/files/wawefofonunuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/5015/5688/files/10312119836.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/xuwogodokogofumafitorig.pdf
    • https://cdn.shopify.com/s/files/1/0429/7395/4204/files/73072988773.pdf
    • https://cdn.shopify.com/s/files/1/0438/2733/1232/files/22782895256.pdf
    • https://cdn.shopify.com/s/files/1/0435/2652/0986/files/edit_text_in_bluebeam_revu.pdf
    • https://cdn.shopify.com/s/files/1/0438/6121/3344/files/71610421766.pdf
    • https://cdn.shopify.com/s/files/1/0434/4417/5013/files/6900954608.pdf
    • https://cdn.shopify.com/s/files/1/0431/4264/3868/files/nebarefonogezobod.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/guwesimutetalajizobanubel.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_off000071dd.bin
7de00975bd94e9c35baea2150de095d22af7ea56aed7f27207a6640b143ffba0
pdf-font-stream PDF embedded font (sfnt) at offset 0x71DD 5392 bytes
font_01_sfnt_off0000845a.bin
c41dbc7d9994dbcccbf37d92c6bfd25089936d6ad0496befa96d538290f8827e
pdf-font-stream PDF embedded font (sfnt) at offset 0x845A 10172 bytes