Malicious PDF — malware analysis report

Static analysis result for SHA-256 63bc05dc71b62f33…

MALICIOUS

PDF

42.2 KB Created: 2020-08-09 03:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec33ae08e0a07779b38742ab9eecceb6 SHA-1: 6b2495132a999799e03890b3031b5af367092c01 SHA-256: 63bc05dc71b62f3392f4e665cca5c4bb62c6fffb530714c6a4d661707831516d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting PDF files, suggesting a link farm for SEO manipulation. One prominent URL, https://ttraff.ru/pify?keyword=physics+formulas+for+class+9+pdf+download, is flagged as a malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier also 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.ru/pify?keyword=physics+formulas+for+class+9+pdf+download
    • http://files.pawsacupuncture.com/uploads/1/3/2/6/132696104/nekola_gefewukulipez.pdf
    • http://files.myladieparadise.com/uploads/1/3/1/8/131872079/134f2e0240.pdf
    • http://zalimura.dnofsinger.com/uploads/1/3/0/7/130776407/d338d05cfb12fb2.pdf
    • http://files.oaa90.com/uploads/1/3/2/6/132695629/lomuresiru_binutanomanaz_jidinonakeneles_namavetizano.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3509/8264/files/wobudipuwe.pdf
    • https://cdn.shopify.com/s/files/1/0428/7175/0823/files/823329248.pdf
    • https://cdn.shopify.com/s/files/1/0433/8044/1238/files/pressure_switch_calibration_procedure.pdf
    • https://cdn.shopify.com/s/files/1/0438/2097/4242/files/longest_common_substring.pdf
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/wivimogofuxagid.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wizivudid.pdf
    • https://cdn.shopify.com/s/files/1/0431/7098/8196/files/71335632323.pdf
    • https://cdn.shopify.com/s/files/1/0439/8999/1582/files/11329332339.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62386903812.pdf
    • https://cdn.shopify.com/s/files/1/0431/1564/3042/files/mixed_perfect_tenses_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/3412/3160/files/nozagin.pdf
    • https://cdn.shopify.com/s/files/1/0430/9870/1977/files/98726980669.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61259485886.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_off00006557.bin
48ae71c0bf88c7bac02b4049bbaae2616d3c908d3e5895b68c9460f5bba354b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6557 5744 bytes
font_01_sfnt_off000078d4.bin
66eb00da2a28b8e0f812a0381bb2f56f2e4d9f5470379f584c2103773452f716		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78D4 10248 bytes

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