Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c6c8f99d358995…

MALICIOUS

PDF

45.9 KB Created: 2020-08-09 20:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78620a37475a41a858ef1509dcd9e14d SHA-1: 2a24ed9b85267f43e8806f1f6e54af6d232bb384 SHA-256: 15c6c8f99d3589956bdefae6612c94ec246876a7abb97782ad08225ec1ff512b
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a synonym worksheet. This indicates a phishing or malware distribution attempt. The presence of numerous other links, many pointing to Shopify-hosted PDFs, suggests a link farm or SEO manipulation tactic to obscure the malicious intent. No scripts were extracted, but the primary malicious functionality appears to be the embedded malicious URL.

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=advanced+synonyms+worksheets+pdf
    • http://files.kmmauthor.com/uploads/1/3/2/6/132682787/ba53bc803d05.pdf
    • http://files.kortisranchwhitetailhunting.com/uploads/1/3/1/8/131871740/e8cbd34e7ccb37.pdf
    • http://kujamag.jamiekincaid.com/uploads/1/3/1/6/131606289/9159061.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/7744/9366/files/php_console_log.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5267/files/julaxewufizuworimanunufo.pdf
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/29317923908.pdf
    • https://cdn.shopify.com/s/files/1/0432/8318/5819/files/category_list.pdf
    • https://cdn.shopify.com/s/files/1/0429/2499/8819/files/13950338349.pdf
    • https://cdn.shopify.com/s/files/1/0437/7162/5621/files/animation_character_design_books.pdf
    • https://cdn.shopify.com/s/files/1/0429/3158/5180/files/73665072360.pdf
    • https://cdn.shopify.com/s/files/1/0435/1547/8176/files/94006231630.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nemopijudesukofareran.pdf
    • https://cdn.shopify.com/s/files/1/0428/9275/5111/files/vavowoxadenasekuxirimutof.pdf
    • https://cdn.shopify.com/s/files/1/0432/1771/5361/files/zojipek.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006637.bin
4916300e9f2d9e4a41d5eb6c18365ff9b60c398cca953a6a672d08f5cade7d26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6637 5412 bytes
font_01_sfnt_off00007885.bin
3f3cd2611f27146cc1f33efcb76076fab379fe38e08f03f2141b79f9250796e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7885 10540 bytes
font_02_sfnt_off00009c7e.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C7E 4324 bytes

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