Malicious PDF — malware analysis report

Static analysis result for SHA-256 683544ded7fa3311…

MALICIOUS

PDF

129.6 KB Created: 2020-07-31 08:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca0251623491100c640efbe208841ea6 SHA-1: 0163fc58d5309eaeb800376adeec62c39b0d17f5 SHA-256: 683544ded7fa3311b18cf7ad1e2a5e448f388b7fe0fa26584a295c595acd95e6
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to redirector infrastructure, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, appears to be a lure related to 'caracteristicas de las bacterias pdf'. The presence of a password-protected archive lure heuristic indicates a common tactic to bypass gateway scanning. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.com/pify?keyword=caracteristicas+de+las+bacterias+pdf
    • http://files.edsworldwide.org/uploads/1/3/2/7/132740320/sotilemiz-gukixedesimujar-bevulas-lativeponeji.pdf
    • http://files.zanyunoodles.com/uploads/1/3/0/7/130739381/sikete-wemotuta.pdf
    • http://files.sumovillarica.com/uploads/1/3/0/8/130814258/jekux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8911/6836/files/fazixumaropulelozuda.pdf
    • https://cdn.shopify.com/s/files/1/0429/2011/6380/files/topufuzuxitovijas.pdf
    • https://cdn.shopify.com/s/files/1/0432/5077/8275/files/zawaxobowizedanovow.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/mojuwexe.pdf
    • https://cdn.shopify.com/s/files/1/0428/0510/0707/files/10888479105.pdf
    • https://cdn.shopify.com/s/files/1/0429/5039/4019/files/wujerafilenasuxu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2355/7030/files/94214557792.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/tilat.pdf
    • https://cdn.shopify.com/s/files/1/0434/6016/5797/files/judalajosefup.pdf
    • https://cdn.shopify.com/s/files/1/0434/3631/0693/files/dakawad.pdf
    • https://cdn.shopify.com/s/files/1/0432/5425/1670/files/30109047081.pdf
    • https://cdn.shopify.com/s/files/1/0435/1960/6936/files/74831741970.pdf
    • https://cdn.shopify.com/s/files/1/0431/0607/4780/files/37752983999.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_off0001bdb8.bin
6a31b7f2f4199cb3cb3af24159c4d92a7ec90db4a2b9366ed70c202b8dce4c62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDB8 4884 bytes
font_01_sfnt_off0001ce5d.bin
36fd53ac055dff7398dda5a5db78b251b271d1761e56a21a8c230d0b33a92d3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE5D 13124 bytes

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