Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3b22368bfc30a9…

MALICIOUS

PDF

51.9 KB Created: 2020-08-06 23:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2a44bf7c3d70f920bdf4c0ae7a00745 SHA-1: b67bfeac39124c340c6e2b683c4362cc7e283439 SHA-256: 0a3b22368bfc30a91230ed935c9b0006b285f268066ea14e8bda440dcf39a204
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to the same malicious URL and other URLs hosted on Shopify and other domains, suggesting a link farm or SEO poisoning tactic to distribute malicious content. No scripts were extracted, but the presence of malicious links indicates an attempt to redirect the user to a compromised site.

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=saxophone+bebop+scales+pdf
    • http://files.indianaliteracy.org/uploads/1/3/1/1/131164520/gakizunexib.pdf
    • http://files.soulop.com/uploads/1/3/0/7/130738806/guzujaburabifu.pdf
    • http://files.vtclinic.com/uploads/1/3/1/8/131856112/a36ed283.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0023/3112/files/dowurukenafabom.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tobilefoseparavako.pdf
    • https://cdn.shopify.com/s/files/1/0433/5344/0414/files/43839115594.pdf
    • https://cdn.shopify.com/s/files/1/0431/1308/7142/files/67833674329.pdf
    • https://cdn.shopify.com/s/files/1/0440/3258/9989/files/fokirugu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0145/4500/files/15017209429.pdf
    • https://cdn.shopify.com/s/files/1/0438/8388/8808/files/niwixadixebiwojelubakawu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8233/3856/files/49075099500.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34292265756.pdf
    • https://cdn.shopify.com/s/files/1/0434/5282/5750/files/barmetro_de_las_amricas_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/7160/2855/files/garmin_nuvi_40lm.pdf
    • https://cdn.shopify.com/s/files/1/0429/2175/4787/files/gunanebif.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61066914906.pdf
    • https://cdn.shopify.com/s/files/1/0430/0642/7299/files/89037031783.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077ed.bin
21034a98e7e34e5f9a4708c002f66b29e90abf1397278113bd713cc43c520d77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77ED 5460 bytes
font_01_sfnt_off00008a79.bin
89b9ee22b0577ff10e8fa959962fdd068329e17fe78e5b91f07f08cd6c03ced4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A79 10132 bytes
font_02_sfnt_off0000ad5d.bin
fb7b45e24c28c4473d0ca1c6410c593992d9a809009f9c41b5ae32c9142507dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD5D 16120 bytes

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