Malicious PDF — malware analysis report

Static analysis result for SHA-256 632e5ec8a3930840…

MALICIOUS

PDF

36.7 KB Created: 2020-08-07 13:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e80f72a0dc0a0284e441a3c68bc94689 SHA-1: 8a3fb62fec4a47beb967a608b1caacc1008badcb SHA-256: 632e5ec8a393084084fd6dc0a6bf72fa8ba2877acd600ec4db2cb5064bc1c5d0
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external PDF files, with one primary link identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs suggests an attempt to direct the user to malicious infrastructure. The document body itself is heavily obfuscated and contains what appears to be a reference to the malicious URL, indicating the likely intent is to trick users into visiting a compromised site.

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.com/pify?keyword=mon+orthographe+illustr%25C3%25A9+pdf
    • http://gopiguri.novelideasbylaura.com/uploads/1/3/0/8/130873951/siselatijin.pdf
    • http://files.bestficoscore.com/uploads/1/3/2/7/132740277/lemezusisunona_famobobakurofa.pdf
    • http://dulawaru.ukimprovement.co.uk/uploads/1/3/1/4/131437532/2295144.pdf
    • http://files.karlasnewhope.com/uploads/1/3/1/4/131406781/5788645.pdf
    • http://files.bergenphotography.net/uploads/1/3/2/6/132682204/1172733.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/wavinirepunu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/dofudubizofibojumo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3435/files/17009844445.pdf
    • https://cdn.shopify.com/s/files/1/0434/1124/3162/files/kowaxu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/jekobafisi.pdf
    • https://cdn.shopify.com/s/files/1/0437/9443/2161/files/ruvasumujogug.pdf
    • https://cdn.shopify.com/s/files/1/0450/8614/6712/files/vlookup_formula_in_excel_step_by_step_with_example.pdf
    • https://cdn.shopify.com/s/files/1/0439/2108/0475/files/figure_drawing_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/9850/5377/files/22197082154.pdf
    • https://cdn.shopify.com/s/files/1/0432/9403/2025/files/nesinuxuwupirufidil.pdf
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/84316157764.pdf
    • https://cdn.shopify.com/s/files/1/0436/9429/3142/files/31417685946.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_off00004e6e.bin
b0d9ac515f189297fb4c7559a9b1e8069553a1e830d9ce2bd713d1c3ac7ff90a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E6E 5452 bytes
font_01_sfnt_off000060ba.bin
87600566146712e4a08fd32890ebefe16561e9dbd0d13a1fa77a06fbe9a2e556		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60BA 11172 bytes

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