Malicious PDF — malware analysis report

Static analysis result for SHA-256 121cf13dfa7ae888…

MALICIOUS

PDF

52.3 KB Created: 2020-08-01 08:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1b102295a64316e86f176f66a6aed88 SHA-1: 4d06fccc4710d3abeef2df5c1682efb1f23c7eae SHA-256: 121cf13dfa7ae888ab6f7c78d5072e615ac62616c11f6981a3ed3d846a2af5a4
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with a critical heuristic firing indicating a link farm pointing to malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous links, including one to a known malicious redirector, suggests a phishing or malicious content distribution attempt.

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/pify?keyword=magna+carta+ps2
    • http://files.hnartworks.com/uploads/1/3/0/8/130874533/jodoxub-fokoj-favizat-xololore.pdf
    • http://files.kimdeering.com/uploads/1/3/0/7/130776167/tidegodolujiril-bogudafa-kuxev.pdf
    • http://files.jsiglobalinc.com/uploads/1/3/1/4/131437725/4836894.pdf
    • http://files.themindfullyscientificmama.com/uploads/1/3/1/6/131637311/1762955.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/0388/5206/files/6765771419.pdf
    • https://cdn.shopify.com/s/files/1/0437/1418/3323/files/gesum.pdf
    • https://cdn.shopify.com/s/files/1/0435/8986/1535/files/16571992900.pdf
    • https://cdn.shopify.com/s/files/1/0433/1762/4990/files/bovuvugabepofalovu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2468/7014/files/how_much_does_lightweight_increase_mining_pseed.pdf
    • https://cdn.shopify.com/s/files/1/0432/8023/6702/files/89058396362.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xodujanizovu.pdf
    • https://cdn.shopify.com/s/files/1/0440/6686/5302/files/55159213193.pdf
    • https://cdn.shopify.com/s/files/1/0429/0438/7750/files/66074854978.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/71482320097.pdf
    • https://cdn.shopify.com/s/files/1/0429/1903/5033/files/38877586365.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_off000062c3.bin
969eb833347ff4d5c6861b5f9aea38c633b0fdb5ba3a63d3f33a2f3eeaa7b685		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C3 10840 bytes
font_01_sfnt_off00008520.bin
5d7ca11134a485f75e560ca3f04536f4d4e7f54a002acc06c5146de86af3cd2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8520 5204 bytes
font_02_sfnt_off000096ef.bin
aec8c41bab7da5c7f64223df738d70c7931583b4b2bf6c7ec78fe7a398fe9df5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96EF 14848 bytes

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