Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fbb41f3772ac77e…

MALICIOUS

PDF

50.5 KB Created: 2020-08-04 22:40:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed47cd03c49b70da4c3a1cff3fc6d0e5 SHA-1: f8f4f277948e2f53c32e3a41d662bc5120f443f8 SHA-256: 0fbb41f3772ac77ea0672ea32eb39b03f55804c288ceeaf93e58a1df46be93f0
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body also contains the same URL, suggesting an attempt to trick the user into downloading a malicious file. The presence of numerous other PDF links further indicates a link farm used for SEO manipulation or distributing malicious content.

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.cc/pify?keyword=classroom+of+the+elite+volume+5+pdf
    • http://files.becomingsarh.com/uploads/1/3/0/7/130739567/3400932.pdf
    • http://files.elizabethcooperdesign.com/uploads/1/3/1/4/131483955/nejuridagekij_texavapaten_jusodo_xujukubitiset.pdf
    • http://files.emilyofwestborough.com/uploads/1/3/0/7/130775969/1968786.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7395/4204/files/22919095483.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1143/files/shake_hands_with_the_devil_book_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/0305/2191/files/65478838666.pdf
    • https://cdn.shopify.com/s/files/1/0431/6246/8503/files/sandvik_catalogo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7098/0245/files/73878902752.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8758/files/lokigevifav.pdf
    • https://cdn.shopify.com/s/files/1/0434/0639/3496/files/21144347147.pdf
    • https://cdn.shopify.com/s/files/1/0434/6531/0373/files/23213102118.pdf
    • https://cdn.shopify.com/s/files/1/0429/8581/6218/files/nimov.pdf
    • https://cdn.shopify.com/s/files/1/0430/3778/6265/files/dejuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6016/files/99130215688.pdf
    • https://cdn.shopify.com/s/files/1/0439/4621/3544/files/read_text_files_java.pdf
    • https://cdn.shopify.com/s/files/1/0434/5721/6678/files/export_html_to_jquery_plugin.pdf
    • https://cdn.shopify.com/s/files/1/0435/7344/4767/files/85022430020.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_off0000555e.bin
4b5dbacdd378b7f5e855a33f7342666799dfa8b0faf41642c01467ba97249c34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x555E 15048 bytes
font_01_sfnt_off0000860e.bin
87cac5b269f91b4c507a8f34dd83ecccb2d5120a808b70f8b1ad39b72d938927		 pdf-font-stream PDF embedded font (sfnt) at offset 0x860E 5372 bytes
font_02_sfnt_off0000982e.bin
8dba7cfeb26c5452090852214fb3f90dfee88e74cf915fe5cf6de7ef12dd9f87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x982E 10716 bytes

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