Malicious PDF — malware analysis report

Static analysis result for SHA-256 1698934908e9d6c5…

MALICIOUS

PDF

49.6 KB Created: 2020-07-31 20:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ac4d930cebc94e1b4f98dba069db2de SHA-1: fb2da284bf9ea8b4713397cd2904440e4ce1de10 SHA-256: 1698934908e9d6c56668b57dd36d1ed2281aa32bb1c73cf928c8a23af5782c71
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, suggesting an attempt to lead the user to malicious content. The document body, though heavily obfuscated, contains text related to 'maths puzzles' and URLs, reinforcing the lure. The presence of many external PDF links, some with numeric slugs, indicates a link farm strategy, likely to improve SEO for malicious content. The ML classifier strongly flagged this PDF as malicious.

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/wb?keyword=maths%20puzzles%20for%20class%2010%20with%20answers%20pdf
    • http://files.maaloufashford.com/uploads/1/3/1/4/131438427/3313529.pdf
    • http://files.senekal.biz/uploads/1/3/1/6/131606128/vupanejobe-dirivu-tazutivifon-bazuwavonisid.pdf
    • http://files.noaries.com/uploads/1/3/1/3/131384113/zitukavodesorodu.pdf
    • http://files.drifterbrewingsystems.com/uploads/1/3/0/7/130775244/detenote.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7295/4269/files/rixakefisus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1317992411.pdf
    • https://cdn.shopify.com/s/files/1/0429/1713/4499/files/38242492275.pdf
    • https://cdn.shopify.com/s/files/1/0435/9300/7272/files/79826032700.pdf
    • https://cdn.shopify.com/s/files/1/0435/4477/2757/files/42080368207.pdf
    • https://cdn.shopify.com/s/files/1/0437/5838/7349/files/pagigavebulufadil.pdf
    • https://cdn.shopify.com/s/files/1/0435/0925/2250/files/sixefafuwum.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1105/files/72068432346.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/monazata.pdf
    • https://cdn.shopify.com/s/files/1/0433/7346/1669/files/zugajawinodulilosudetiti.pdf
    • https://cdn.shopify.com/s/files/1/0434/7510/7990/files/3916508601.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90840236881.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_off000081c3.bin
0c5e62fbbcc5450ef9b5c77458a70459b9c2ffeb808e23e72d5c6896c002cc75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81C3 5584 bytes
font_01_sfnt_off000094eb.bin
a0a6a895e45e23b49c72c256e134df5d7f1ce8f6f7ce7d411a15bc9decf20230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94EB 10788 bytes

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