Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeac542fc3495b3d…

MALICIOUS

PDF

39.4 KB Created: 2020-08-17 15:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3ff39d0fb5c08617ad18011d0d4c7b8 SHA-1: dad932efe460e172b6e283b2d9573d2547aaf800 SHA-256: aeac542fc3495b3d87a1845b4d7fe9fe32c5953b75f56440bd4138c2841d2b5c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=active+listening+quiz+pdf' which is likely intended to lead the user to malicious content. The presence of numerous links to Shopify domains suggests an attempt to blend in with legitimate content while hosting malicious redirects.

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=active+listening+quiz+pdf
    • http://files.anjali-nath.com/uploads/1/3/1/4/131453623/tawosezekofafe_puvusuvuwet.pdf
    • http://files.macrossanchambers.com/uploads/1/3/2/6/132696060/dekufapejitak_kibafoge_merewom_zufarab.pdf
    • http://files.thereedmachine.com/uploads/1/3/0/8/130874162/43bd8.pdf
    • https://cdn.shopify.com/s/files/1/0431/1033/4620/files/ungrouped_frequency_distribution_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/3070/0455/files/60426211091.pdf
    • https://cdn.shopify.com/s/files/1/0432/5680/7586/files/55177899314.pdf
    • https://cdn.shopify.com/s/files/1/0432/2410/5124/files/zoforopesenejuf.pdf
    • https://cdn.shopify.com/s/files/1/0429/1490/6279/files/minecraft_rule_34.pdf
    • https://cdn.shopify.com/s/files/1/0432/7089/7824/files/the_biology_of_belief_bruce_lipton_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/3640/8982/files/92673574628.pdf
    • https://cdn.shopify.com/s/files/1/0434/1065/3338/files/pinitujizefajeze.pdf
    • https://cdn.shopify.com/s/files/1/0437/5730/6007/files/xozukoxipiworuxiko.pdf
    • https://cdn.shopify.com/s/files/1/0435/8311/1336/files/dakavujolabeni.pdf
    • https://cdn.shopify.com/s/files/1/0431/8897/7815/files/dilutosawudonunaz.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d5e.bin
0f6605a9435d2d016f97f66bde2633fa9e282f6fe5de4ae9610369e3b8164987
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D5E 5244 bytes
font_01_sfnt_off00006f4c.bin
36ca39f6bde1376d48946b74d74479809dda3d4061e5c8026d1a5930ba7d06ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F4C 9880 bytes