Malicious PDF — malware analysis report

Static analysis result for SHA-256 749323def4e7fca2…

MALICIOUS

PDF

35.2 KB Created: 2020-08-01 04:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e093f2a6602bc5914d7f1989b39b8dff SHA-1: b59c3695ad4e37e8b74d685b8a7148662b9beed8 SHA-256: 749323def4e7fca212641c120424ef394ed46ca262d8628810a624baee9243e3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify-hosted PDFs, suggesting a link farm or SEO spam campaign. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=brother+gx-+6750+manual'. The document body, though heavily obfuscated, contains references to the Brother GX-6750 manual, likely a lure to disguise the malicious intent.

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=brother+gx-+6750+manual
    • http://files.easternshorechess.com/uploads/1/3/1/3/131382531/guriperoforozige.pdf
    • http://files.amyshomedaycare.com/uploads/1/3/0/9/130969683/lebajexazaxajedowu.pdf
    • http://files.dioncondack.com/uploads/1/3/0/8/130814706/mitizusukel-loluzegisowamu-fakutira-wojaresusagup.pdf
    • http://files.riccio-builders.com/uploads/1/3/0/7/130775851/tukas_luwotijuzez_sixomawedufij.pdf
    • http://files.casa-de-colores.com/uploads/1/3/0/7/130776162/1873473.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2313/7957/files/gegidivazodesideje.pdf
    • https://cdn.shopify.com/s/files/1/0430/4352/0666/files/fedojipamibalagifuvita.pdf
    • https://cdn.shopify.com/s/files/1/0434/4234/0007/files/madalisadonowurikilotulaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/0533/0083/files/tolixefabumuwewesoko.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5085/files/converter_libras_em_kg.pdf
    • https://cdn.shopify.com/s/files/1/0433/6350/0197/files/gezufupixusesoge.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/18981980774.pdf
    • https://cdn.shopify.com/s/files/1/0431/3320/6690/files/tibetomotepi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3491/8568/files/murotokavufi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2306/files/mukijigonegegedaderovirag.pdf
    • https://cdn.shopify.com/s/files/1/0429/4141/5580/files/meluzipu.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_off00004923.bin
5e75694db26afdac7c60c5139fbcfdc8c0e5863ca527838073a9df1c0c22fe1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4923 5572 bytes
font_01_sfnt_off00005c02.bin
cee9dd410157a13048d9de32f1b3007fc322b5be98f1b0c333a9f7a55264b428		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C02 10244 bytes

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