Malicious PDF — malware analysis report

Static analysis result for SHA-256 c960059413621e12…

MALICIOUS

PDF

41.4 KB Created: 2020-08-24 11:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d08fc44a0c73528710eafc50b70504e7 SHA-1: 7762bf535f1973d3cb545de2eef09cd059afd9c1 SHA-256: c960059413621e123d8431ec22385bffac3bb9d38b4ef30b2f49067b8a2b16ae
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a redirector infrastructure. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics as a known malicious redirector. This suggests the document is designed to redirect users to malicious sites, likely for SEO poisoning or phishing purposes.

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=division+of+polynomials+by+monomials+worksheet+pdf
    • http://files.homesbyevamarin.net/uploads/1/3/0/7/130740589/zatajabebe.pdf
    • http://leverexi.strosebasketball.com/uploads/1/3/1/4/131407424/ruzutedutagabut.pdf
    • http://tepedono.oiaracing.com/uploads/1/3/0/7/130739777/df83c.pdf
    • http://files.juddmillerauthor.com/uploads/1/3/1/4/131438541/wajotumedo.pdf
    • http://files.collier-pave.com/uploads/1/3/1/8/131856232/sesike.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9142282406.pdf
    • https://cdn.shopify.com/s/files/1/0433/5638/9528/files/xiladiwugirofabobuvesa.pdf
    • https://cdn.shopify.com/s/files/1/0434/3640/8982/files/91222213029.pdf
    • https://cdn.shopify.com/s/files/1/0429/9046/9283/files/treinamento_desenvolvimento_e_aprendizagem_organizacional.pdf
    • https://cdn.shopify.com/s/files/1/0447/8137/1543/files/biblia_cristiana_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/79256306476.pdf
    • https://cdn.shopify.com/s/files/1/0452/5922/7296/files/chrome_setup_latest.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/94220334898.pdf
    • https://cdn.shopify.com/s/files/1/0438/1851/6637/files/73555579004.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5800/files/teoria_de_aprendizagem_social.pdf
    • https://cdn.shopify.com/s/files/1/0429/5491/5993/files/zifiwapu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0097/8853/files/19583827360.pdf
    • https://cdn.shopify.com/s/files/1/0433/2909/3800/files/chemistry_11th_book_download.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000612c.bin
faf51903740f570c483c7f9e97f15c5fb128f7a0214ab5d7295264939af801e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x612C 5740 bytes
font_01_sfnt_off00007494.bin
3000f9c52751a8e660e4c485ad9bf6ff4ed0fcefe7861788490eacc894cab6fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7494 10396 bytes

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