Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c26b9fdc428e4e…

MALICIOUS

PDF

38.7 KB Created: 2020-08-19 03:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38b337121b4a4d3f31cf248af11a2608 SHA-1: e2ae1465b74bbf652e1b021f3c6aba1e7fac2762 SHA-256: 84c26b9fdc428e4e0b6cd7549972f510ae0462f595a4bd91af8f63a1c7426d34
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of the primary links redirects to a known malicious redirector. The document body, though obfuscated, contains the text 'Polar bonds and electronegativity worksheet answers' and the malicious URL, suggesting a lure to trick users into visiting potentially harmful sites. The presence of numerous links and a malicious redirector indicates an attempt to drive traffic to malicious infrastructure.

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=polar+bonds+and+electronegativity+worksheet+answers
    • http://files.coloradocowboycalendar.org/uploads/1/3/1/6/131606201/wujakix.pdf
    • http://files.atelierchalet.com/uploads/1/3/0/8/130874063/gibawalasilunojef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/6164/7262/files/finoxomimepefomawuzefimu.pdf
    • https://cdn.shopify.com/s/files/1/0436/3301/6982/files/2023307462.pdf
    • https://cdn.shopify.com/s/files/1/0433/7077/4693/files/18941805203.pdf
    • https://cdn.shopify.com/s/files/1/0436/0844/0990/files/14387569156.pdf
    • https://cdn.shopify.com/s/files/1/0430/5993/7434/files/pixark_pc_free_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0428/7807/5036/files/53652155341.pdf
    • https://cdn.shopify.com/s/files/1/0428/8099/1388/files/what_does_the_sims_3_generations_include.pdf
    • https://cdn.shopify.com/s/files/1/0435/8098/1403/files/83013766931.pdf
    • https://cdn.shopify.com/s/files/1/0429/9295/9642/files/dewujo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3452/5347/files/bepabifix.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/39174418939.pdf
    • https://cdn.shopify.com/s/files/1/0434/2949/4933/files/tevuto.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_off00005642.bin
190e3d6a85ac80844884aeea74697c633e8af93296bf6bd69d0a1244a6a76103
pdf-font-stream PDF embedded font (sfnt) at offset 0x5642 5660 bytes
font_01_sfnt_off0000698c.bin
8657c33e0af7de59f054461d5817a9268198e7913d164cd29eda164664e38e91
pdf-font-stream PDF embedded font (sfnt) at offset 0x698C 10144 bytes