Malicious PDF — malware analysis report

Static analysis result for SHA-256 035d551a3ee47bc5…

MALICIOUS

PDF

40.1 KB Created: 2020-08-10 06:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef92c44c0e5a041ef4f13d32cdcd58dc SHA-1: 3d565aa819bf630b4616ea458dc51cf94898721e SHA-256: 035d551a3ee47bc537121b4f4ba54dab41cc09ac901d47788c3e01fad51d0080
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many pointing to Shopify domains, but also includes a critical link to a known malicious redirector at `https://ttraff.ru/pify?keyword=organic+compounds+containing+nitrogen+notes+pdf`. The heuristic firings indicate this is a link farm designed for SEO manipulation, likely to drive traffic to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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=organic+compounds+containing+nitrogen+notes+pdf
    • http://files.thejugglingscientist.com/uploads/1/3/0/9/130969657/semimutixuvi-xazukibijan.pdf
    • http://files.johannadunaway.com/uploads/1/3/1/0/131070560/663952.pdf
    • http://files.pleasanthillartcenter.com/uploads/1/3/1/1/131163859/e64779a8104.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4586/3067/files/microbiologia_medica_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0434/9942/1856/files/49963279831.pdf
    • https://cdn.shopify.com/s/files/1/0431/4333/2000/files/physics_formulas_pdf_for_eamcet.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/bibatudopegumufupavas.pdf
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/vijagikiwupu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6241/9863/files/66892515734.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/pewogubuzu.pdf
    • https://cdn.shopify.com/s/files/1/0451/3293/9429/files/spanish_learning_books_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0427/6980/9564/files/38813686968.pdf
    • https://cdn.shopify.com/s/files/1/0432/2764/4072/files/4960347203.pdf
    • https://cdn.shopify.com/s/files/1/0429/6556/5589/files/24777171113.pdf
    • https://cdn.shopify.com/s/files/1/0438/4335/4781/files/come_si_fa_l_analisi_logica.pdf
    • https://cdn.shopify.com/s/files/1/0430/8146/6005/files/zerepajole.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_off00005e21.bin
fac33dd567889ad80110745a2b1e82a8b73845bf8226214e61073fd0745ad1d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E21 5468 bytes
font_01_sfnt_off000070a3.bin
c6c56f79caf3083a1e4a3e5d77e6ccb9289aceb2cd66f0467b3a83eb9e326b9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70A3 10008 bytes

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