Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c6f533437988e8…

MALICIOUS

PDF

40.6 KB Created: 2020-08-23 18:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ac65cb87b340b089c8498584c3ba204 SHA-1: c6405182e3e1f351b28301c23c9c796ab29c2e4c SHA-256: 83c6f533437988e8b74f6cd524d49ecf45c9e03f805e0db27eec317b44e0cea6
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, `https://ttraff.cc/pify?keyword=pros+and+cons+of+artificial+intelligence+pdf`, which is designed to lead users to further malicious content. The document also hosts a large number of external PDF links, suggesting a link farm or SEO poisoning attempt. While no scripts were directly extracted, the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

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=pros+and+cons+of+artificial+intelligence+pdf
    • http://lujikazos.saratogatemple.org/uploads/1/3/2/7/132712615/rozonar.pdf
    • http://files.vujadeaudio.com/uploads/1/3/2/6/132682686/5137128.pdf
    • http://butofe.lebeausejour.ch/uploads/1/3/0/8/130814526/5940941.pdf
    • http://gusodok.angelicinfusionart.com/uploads/1/3/1/4/131408224/zikezi-vewimisutegojew-pusin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9390/0958/files/64398007517.pdf
    • https://cdn.shopify.com/s/files/1/0428/8600/4899/files/visixobifirepepebozejabe.pdf
    • https://cdn.shopify.com/s/files/1/0432/5349/8019/files/dietoterapia_cirrose_hepatica.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/ref_cursor_query_in_oracle_reports_example.pdf
    • https://cdn.shopify.com/s/files/1/0434/1828/8277/files/pomalijudukel.pdf
    • https://cdn.shopify.com/s/files/1/0438/0737/5522/files/vidmate_apk_all_old_version.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0818/files/ratol.pdf
    • https://cdn.shopify.com/s/files/1/0435/1596/9688/files/34977888275.pdf
    • https://cdn.shopify.com/s/files/1/0428/6126/5062/files/godogoluxavo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7473/8581/files/26831868402.pdf
    • https://cdn.shopify.com/s/files/1/0440/1351/9006/files/magento_stack_exchange.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_off000060a4.bin
1f49f5be16b283bb1d36f494670285cefe1541e1edf42ac2ef0cbc77d74f0619		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60A4 5324 bytes
font_01_sfnt_off000072c6.bin
a50b51c45295b4c9ea533e589651c0eb7cd52d31349a16aa9d8a5c120bcbd1ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72C6 10120 bytes

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