Malicious PDF — malware analysis report

Static analysis result for SHA-256 862b6f4ae240c07b…

MALICIOUS

PDF

46.8 KB Created: 2020-08-08 05:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8342a944380f351debfc1262cd493649 SHA-1: 424b33c28a72f02ec964f2e5183566f7ff5513d3 SHA-256: 862b6f4ae240c07b56eea4c1da3e4a3b9c13e57e04ef532c990a702619f1aa94
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which are designed to appear as legitimate academic resources but redirect to a known malicious URL. This technique is commonly used to distribute malware or phish for credentials. The ML classifier strongly indicated maliciousness, supporting the heuristic findings.

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=potenciacion%20de%20numeros%20naturales%20ejercicios%20pdf
    • http://files.miwt.org/uploads/1/3/0/9/130969310/3ac33d.pdf
    • http://files.germanroastednutsms.com/uploads/1/3/2/6/132682022/rewoxib-remesa-siziwo.pdf
    • http://files.beantownscience.com/uploads/1/3/1/3/131382113/wujiwexolevov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/3235/4727/files/b_m_sharma_physics_for_neet.pdf
    • https://cdn.shopify.com/s/files/1/0438/4922/0256/files/cardiology_case_files.pdf
    • https://cdn.shopify.com/s/files/1/0435/0168/2843/files/periodic_trigonometric_functions.pdf
    • https://cdn.shopify.com/s/files/1/0440/1247/0422/files/vufogiz.pdf
    • https://cdn.shopify.com/s/files/1/0434/7333/8533/files/98806297780.pdf
    • https://cdn.shopify.com/s/files/1/0439/2160/4763/files/80817765307.pdf
    • https://cdn.shopify.com/s/files/1/0432/4897/6032/files/71445356817.pdf
    • https://cdn.shopify.com/s/files/1/0432/1076/8546/files/mavuwulanowowuxuvap.pdf
    • https://cdn.shopify.com/s/files/1/0427/8019/7031/files/hemostasis_mcq.pdf
    • https://cdn.shopify.com/s/files/1/0431/6925/1487/files/lekakubuzagifajepilokunin.pdf
    • https://cdn.shopify.com/s/files/1/0437/8247/1837/files/95450584932.pdf
    • https://cdn.shopify.com/s/files/1/0432/4058/7423/files/equidad_de_genero_ensayo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065c1.bin
d4f1a8a23d9360982da49806b75be2e9cb1760a134540d13334f1f4c535c83aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65C1 5260 bytes
font_01_sfnt_off00007786.bin
f7903e6ed29cd17e6ad7c1520656545ebbb2eeadb9da27684bd35e66cd47a984		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7786 11824 bytes
font_02_sfnt_off00009e0f.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E0F 4324 bytes

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