Malicious PDF — malware analysis report

Static analysis result for SHA-256 612c384bbac79297…

MALICIOUS

PDF

43.5 KB Created: 2020-08-13 11:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7c06d9413953fc6fa8f3ea48a13b55b SHA-1: 43609d4f070290ebfdcc9afd987a45e3c4ccdd0c SHA-256: 612c384bbac79297e09c039af5de265c8e24b63ab9d971667865b606eeecba63
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 external PDF files hosted on Shopify. One of these links, https://ttraff.ru/wb?keyword=preterito%20indefinido%20regulares%20ejercicios%20pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious infrastructure under the guise of providing PDF exercises.

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/wb?keyword=preterito%20indefinido%20regulares%20ejercicios%20pdf
    • http://wutorusi.stylebysooph.com/uploads/1/3/1/1/131164312/9915539.pdf
    • http://sigobofu.terraceminorsoftball.com/uploads/1/3/2/7/132741099/sejafiredar.pdf
    • http://files.yellowrivercalls.com/uploads/1/3/0/8/130874035/7218064.pdf
    • http://konibibaw.alabamacivicchorale.com/uploads/1/3/1/4/131482975/mizikokowizuza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/8640/4000/files/nagapapaziwewixatezipevap.pdf
    • https://cdn.shopify.com/s/files/1/0434/2244/9820/files/arpack_tedavisi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8206/3777/files/44815025875.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/88054929949.pdf
    • https://cdn.shopify.com/s/files/1/0431/0581/2629/files/vuzegefetuxes.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/factoring_trinomials_practice_problems.pdf
    • https://cdn.shopify.com/s/files/1/0438/3784/9762/files/a_whole_new_world_twisted_tale.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5807/files/69773579262.pdf
    • https://cdn.shopify.com/s/files/1/0436/1850/0765/files/bimupugemobiziv.pdf
    • https://cdn.shopify.com/s/files/1/0438/4437/0594/files/mathematics_for_economists_pemberton.pdf
    • https://cdn.shopify.com/s/files/1/0431/3707/3314/files/antiphospholipid_antibody_syndrome_review.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/musuvagexas.pdf
    • https://cdn.shopify.com/s/files/1/0440/0221/4046/files/strength_training_anatomy_3rd_edition_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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067de.bin
813e6cfc5a9b8c2640808e88582582f18b07ea040efced5ddc1ef792a9d3dc6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67DE 5400 bytes
font_01_sfnt_off00007a4f.bin
f9415707564da25a94f1e88e016ca563c30a3d9e814f33a0affbe683b1fc7f3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A4F 11312 bytes

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