Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a382c5881e1964…

MALICIOUS

PDF

39.5 KB Created: 2020-08-19 11:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5062061f1d01a8243e6ae62a947cfb6 SHA-1: 8aebdbe24eddaea9486a5083aae0755bae7311a2 SHA-256: 15a382c5881e1964245598884d9244fde67de62a3b5c1b5124a018afbdd36bad
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://ttraff.cc/pify?keyword=british+journal+of+sociology+of+education+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to academic publications and the tool 'wkhtmltopdf', likely to lend legitimacy to the malicious links. No scripts were extracted, but the presence of numerous external links and a malicious redirector indicates an attempt to lead the user to harmful 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=british+journal+of+sociology+of+education+pdf
    • http://files.thierryrmontoya.com/uploads/1/3/1/4/131438460/4767722.pdf
    • http://files.sandblast-arts.org/uploads/1/3/1/4/131483603/wigigavogudokod_pobaf.pdf
    • http://fagosi.mistrasgrouplearncenter.com/uploads/1/3/1/4/131453540/5635920.pdf
    • http://files.aurorabreath.com/uploads/1/3/0/7/130740173/f0b2983d86.pdf
    • http://files.hamtaladesigns.com/uploads/1/3/1/3/131380042/fiwofebevut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4444/5082/files/likekufa.pdf
    • https://cdn.shopify.com/s/files/1/0432/4573/2007/files/iron_deficiency_anemia.pdf
    • https://cdn.shopify.com/s/files/1/0433/7103/6823/files/cookie_clicker_auto_golden_cookie.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5023/files/suzofukoretaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/2524/4053/files/new_blob_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0437/8699/3813/files/email_writing_examples_informal.pdf
    • https://cdn.shopify.com/s/files/1/0428/9029/7503/files/leluwofaxawo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0398/5570/files/arrastrado_por_el_mar.pdf
    • https://cdn.shopify.com/s/files/1/0434/6544/1430/files/7619072089.pdf
    • https://cdn.shopify.com/s/files/1/0437/6929/9098/files/80167022247.pdf
    • https://cdn.shopify.com/s/files/1/0434/1219/3438/files/98113465286.pdf
    • https://cdn.shopify.com/s/files/1/0432/3531/1784/files/oxford_discover_2_grammar_book.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_off000059b7.bin
d7365cf707bf6a45a166bc64a776b66098b9fa86972dc1b6654c9b1b32ca2280		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59B7 5644 bytes
font_01_sfnt_off00006ced.bin
4cb27eec8c1b61a7240377929cc542acdccf855f67b4894d5af81e15987b5ece		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CED 10536 bytes

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