Malicious PDF — malware analysis report

Static analysis result for SHA-256 71cd24eb4f0e24f6…

MALICIOUS

PDF

46.3 KB Created: 2020-07-31 08:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6297b42d21204cc38698ddf0e07ad2e2 SHA-1: b9d7430a6b8ca6ba8b9d39d401f0c8110664e4bc SHA-256: 71cd24eb4f0e24f62bdca9d32f773f8d66367d82b08a5ccccc6c584099dcb24c
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it redirects to known malicious infrastructure. The document body, though heavily obfuscated, contains text related to 'APA referencing style 6th edition pdf download', suggesting a lure. The embedded URL points to a redirector, which is a common technique for delivering malicious payloads or phishing pages.

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.ru/pify?keyword=apa+referencing+style+6th+edition+pdf+download
    • http://files.kew-llc.com/uploads/1/3/1/3/131380848/2a235f29c.pdf
    • http://files.rachelmathieudesign.com/uploads/1/3/1/4/131482941/cebeb.pdf
    • http://files.tectonichospitality.com/uploads/1/3/1/0/131070612/5949657.pdf
    • http://files.jayforhouse.com/uploads/1/3/0/7/130775400/wipafodozoxam_samigegos.pdf
    • http://files.sittieandsage.com/uploads/1/3/0/7/130739463/89119.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/runuwadobona.pdf
    • https://cdn.shopify.com/s/files/1/0432/6054/3138/files/5044969040.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27482348981.pdf
    • https://cdn.shopify.com/s/files/1/0437/5746/9845/files/fexoxipimope.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86593634255.pdf
    • https://cdn.shopify.com/s/files/1/0428/4419/2935/files/34247053083.pdf
    • https://cdn.shopify.com/s/files/1/0432/0978/5512/files/2260575590.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/71368738513.pdf
    • https://cdn.shopify.com/s/files/1/0437/7218/2685/files/surulozifagomavivurafetex.pdf
    • https://cdn.shopify.com/s/files/1/0433/4977/0408/files/bigavakazefobolujuna.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_off000074db.bin
648439c6032298a98e6530a71896e940dbe1e83fe5b2cda079ac7da1cd98e19d
pdf-font-stream PDF embedded font (sfnt) at offset 0x74DB 5540 bytes
font_01_sfnt_off000087ba.bin
b1cb3657ef71026cd230005198a9c59f0858735c277edc8a5a7bce4058fb49b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x87BA 10648 bytes