Malicious PDF — malware analysis report

Static analysis result for SHA-256 62cd74ae6b9e548f…

MALICIOUS

PDF

59.2 KB Created: 2020-08-12 19:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a778471b3431b4b3dbc4ccbf523b6319 SHA-1: d022764de44ea52c85d81c4942bcf419b83da290 SHA-256: 62cd74ae6b9e548f042e94d9677d19e7cd31cf842b3bcfe4d672543f28323fbc
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially malicious redirectors, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The embedded URL, 'https://ttraff.com/wb?keyword=lectures%20on%20macroeconomics%20blanchard%20pdf%20download', is a primary indicator of this malicious activity. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same suspicious URL, suggesting an attempt to disguise malicious links as legitimate downloads.

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.com/wb?keyword=lectures%20on%20macroeconomics%20blanchard%20pdf%20download
    • http://files.nationalwealthcenterclub.com/uploads/1/3/1/1/131163578/fomizovesaru-wetegefileta-rijoduzafemex-fenikitamur.pdf
    • http://wenana.thestrongestfish.co.uk/uploads/1/3/1/0/131070420/6d2c38e62a.pdf
    • http://files.newcreationeq.com/uploads/1/3/1/4/131413718/241bf4c594ec3.pdf
    • http://najadem.heavenswingsonline.com/uploads/1/3/2/7/132740214/3786089.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4896/8090/files/oxford_english_dictionary_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/6516/3422/files/33152141594.pdf
    • https://cdn.shopify.com/s/files/1/0432/3095/3627/files/gebasazamafuvax.pdf
    • https://cdn.shopify.com/s/files/1/0440/0414/7350/files/american_english_file_1_second_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/9508/1625/files/83304358200.pdf
    • https://cdn.shopify.com/s/files/1/0437/3594/1274/files/rawexobowu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/bovetekofa.pdf
    • https://cdn.shopify.com/s/files/1/0431/1682/2692/files/minecraft_nether_hub.pdf
    • https://cdn.shopify.com/s/files/1/0439/4736/0424/files/laloso.pdf
    • https://cdn.shopify.com/s/files/1/0429/3240/4380/files/merobonelokajovisomel.pdf
    • https://cdn.shopify.com/s/files/1/0434/9735/7472/files/59990641246.pdf
    • https://cdn.shopify.com/s/files/1/0431/3615/5809/files/ashrae_55.pdf
    • https://cdn.shopify.com/s/files/1/0429/4053/0854/files/north_america_map_hd.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_off0000a76a.bin
e30daa84584811c4a6b641999781120998822e52468430876d227809491f9227		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA76A 5568 bytes
font_01_sfnt_off0000ba34.bin
8dd801dd305a0a9cf2998522371d5079b1550efea8a441a8016cdf903b6a0988		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA34 10984 bytes

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