Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b39e80fc475ba85…

MALICIOUS

PDF

38.6 KB Created: 2020-08-17 09:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ba1c5231e24622debe5c7e990120145 SHA-1: 18c845d528199d2453eebaa3af6c1235814dbe99 SHA-256: 6b39e80fc475ba85100fd0770821d296e34294202f0acec43dfe47f711051a41
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one critical heuristic identifying it as a redirector link to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to trick users into clicking it. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy, likely to obscure the malicious destination. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

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/pify?keyword=cataracts+pathophysiology+pdf
    • http://files.mdcsmith.com/uploads/1/3/0/9/130969469/7fb01d3fb51.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6260/7520/files/gipiwepefebirobewujoselaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/6400/8605/files/candy_ke_word.pdf
    • https://cdn.shopify.com/s/files/1/0434/8621/6344/files/87973232155.pdf
    • https://cdn.shopify.com/s/files/1/0437/7922/7810/files/wupusotesulemoti.pdf
    • https://cdn.shopify.com/s/files/1/0428/3429/6988/files/92740303934.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/73634488417.pdf
    • https://cdn.shopify.com/s/files/1/0435/4847/5541/files/nagoxamedominamejoru.pdf
    • https://cdn.shopify.com/s/files/1/0433/4796/8149/files/ffx_cloudy_mirror.pdf
    • https://cdn.shopify.com/s/files/1/0432/3554/1151/files/best_thesaurus_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0433/7431/3621/files/minor_cofactor_and_adjoint_of_a_matrix.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_off000059fc.bin
3cf2b25ad4118d2a697da797cf9914fda48f2dc23f72044ab3f480c1a719d46b
pdf-font-stream PDF embedded font (sfnt) at offset 0x59FC 5424 bytes
font_01_sfnt_off00006c66.bin
cb8a769943573fe397e3ab9026840239dc7297440aa34df1537c8a8f20011d8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C66 9832 bytes