Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e7e6d34e22edad…

MALICIOUS

PDF

39.7 KB Created: 2020-08-15 08:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aae96662c40e8d8011a7d593637ee507 SHA-1: 9642ee6ddba2ca3bf9af524ffab1b33031876969 SHA-256: 13e7e6d34e22edadd18bf9d161d1f349a9cb9abb3c880c53d65a703689597be5
154 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 benign content, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to lure users to potentially harmful content. The ML classifier strongly flagged this PDF as malicious, reinforcing the assessment of a malicious redirector attack.

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=adjectives+and+adverbs+list+with+meaning+pdf
    • http://files.dylankerrigan.com/uploads/1/3/0/7/130738620/masiral.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2724/2906/files/23375865919.pdf
    • https://cdn.shopify.com/s/files/1/0435/4896/7061/files/mechanics_of_machines_cleghorn.pdf
    • https://cdn.shopify.com/s/files/1/0433/7496/8997/files/24226078300.pdf
    • https://cdn.shopify.com/s/files/1/0430/9313/1425/files/mezuwamexipasozerapore.pdf
    • https://cdn.shopify.com/s/files/1/0436/2610/2947/files/29138068384.pdf
    • https://cdn.shopify.com/s/files/1/0433/7352/7203/files/tumereseluk.pdf
    • https://cdn.shopify.com/s/files/1/0437/8096/4510/files/57664758082.pdf
    • https://cdn.shopify.com/s/files/1/0449/3810/0891/files/brotherhood_of_war_full_movie.pdf
    • https://cdn.shopify.com/s/files/1/0436/6529/3462/files/88175955164.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_off00005bd3.bin
2ac4e574becd39d65c43e3ce3927ded00af4c32cae367833f1ce646bd88a3e1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD3 5924 bytes
font_01_sfnt_off00006fe9.bin
238e9f4dc0d0f6120683a7a031003e04e7373585fdef0d5ecfe27307df7a0c75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE9 10140 bytes

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