Malicious PDF — malware analysis report

Static analysis result for SHA-256 985cda96bbc1ce75…

MALICIOUS

PDF

44.8 KB Created: 2020-07-24 17:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb1595899edbae4f6f6297966a80c9e5 SHA-1: f5ade6d25f104823e940a007b4d0ffc3e68896ad SHA-256: 985cda96bbc1ce7539688676deb893b1493515fd7d39a915e9d2f10567111eca
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a high number of embedded links, including one pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that the link at https://ttraff.ru/pify?keyword=modest+proposal+questions+and+answers is associated with malicious infrastructure. Additionally, the 'PDF_SEO_LINK_FARM' heuristic suggests the document is part of a link farm designed to manipulate search engine results, likely to drive traffic 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.ru/pify?keyword=modest+proposal+questions+and+answers
    • http://files.mountainbodyworkers.org/uploads/1/3/1/3/131398322/43e1754c5a001.pdf
    • http://files.sydneywippman.com/uploads/1/3/1/4/131453595/lisin_gazebanirej.pdf
    • http://files.dog-gone-running.com/uploads/1/3/0/8/130874266/6564663.pdf
    • http://files.aforactive.co.uk/uploads/1/3/0/7/130739062/sanajeleli.pdf
    • http://files.colinblumenau.com/uploads/1/3/0/8/130814706/sitarezevafof_bitagurapezez_wudevejakuga.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/88638319464.pdf
    • https://cdn.shopify.com/s/files/1/0431/5106/5243/files/kazeruvip.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9236/files/rifup.pdf
    • https://cdn.shopify.com/s/files/1/0431/5011/4967/files/53932769635.pdf
    • https://cdn.shopify.com/s/files/1/0434/5266/1912/files/givejesep.pdf
    • https://cdn.shopify.com/s/files/1/0431/8075/3058/files/940092720.pdf
    • https://cdn.shopify.com/s/files/1/0430/7976/2073/files/zosefapub.pdf
    • https://cdn.shopify.com/s/files/1/0432/4936/9252/files/tafunadamosej.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98559129476.pdf
    • https://cdn.shopify.com/s/files/1/0434/2402/2680/files/bukizexazin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/norojakibi.pdf
    • https://cdn.shopify.com/s/files/1/0436/2931/4206/files/94476522094.pdf
    • https://cdn.shopify.com/s/files/1/0435/3094/4671/files/gedoxufoxip.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_off00007154.bin
acf1e1c206e84a6037b6d6a3bcec89aeade4b49b71518f47c38c5b8ad5ce587b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7154 5056 bytes
font_01_sfnt_off000082a4.bin
ad04410cda154f305f2bcf50c20d57c48c50f2c74835f6489e0b070348a104fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82A4 10412 bytes

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