Malicious PDF — malware analysis report

Static analysis result for SHA-256 5126a258761ff025…

MALICIOUS

PDF

48.2 KB Created: 2020-07-30 20:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fada58670b42c2d45a8f50e2e3776eb8 SHA-1: 0d514434d6247c13343f6fae86cd8c965ef95241 SHA-256: 5126a258761ff025a4c2bc1a6436ae7dc45a75dc1caa2716b62ea6e26f7a9c8b
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary URL pointing to a known malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and PDF_SEO_LINK_FARM indicates a link farm strategy. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be corrupted or obfuscated, but the presence of the URL and the heuristics strongly suggest a malicious redirection attempt.

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=black+rage+in+new+orleans+pdf
    • http://files.pastaqueensg.com/uploads/1/3/1/1/131164236/situmikixadel-bowumomakap-lizagome.pdf
    • http://files.peterson-equipment.com/uploads/1/3/2/6/132682790/4bfbacaebb4d.pdf
    • http://files.amazingdownunder.com/uploads/1/3/2/7/132740747/dosobibotasomim.pdf
    • http://files.blackbreadandjam.com/uploads/1/3/1/0/131071167/da0f120c7e0e4e.pdf
    • http://files.southplainsgentx.org/uploads/1/3/1/6/131637635/lizibipi.pdf
    • http://files.southplainsgentx.org
    • https://cdn.shopify.com/s/files/1/0434/9735/7472/files/dufufanovawurofad.pdf
    • https://cdn.shopify.com/s/files/1/0432/8131/8056/files/fovereduzuxixudijof.pdf
    • https://cdn.shopify.com/s/files/1/0433/0297/7700/files/wixapezujutogi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9636/7511/files/74477482584.pdf
    • https://cdn.shopify.com/s/files/1/0434/1058/7800/files/87451572843.pdf
    • https://cdn.shopify.com/s/files/1/0435/1954/1416/files/50007438001.pdf
    • https://cdn.shopify.com/s/files/1/0428/5313/8591/files/52817846007.pdf
    • https://cdn.shopify.com/s/files/1/0428/1437/4047/files/781295383.pdf
    • https://cdn.shopify.com/s/files/1/0431/2068/9306/files/20130385109.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1105/files/lodigi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8869/9802/files/18759198498.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_off00007dfc.bin
59582c748a629035acc6670483371ee6106ebcd97e1e70c52f5871caa377d200
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DFC 5236 bytes
font_01_sfnt_off00008fe0.bin
ab90839c0f1c6c7ec92151d784b4778f7e8ceeb0fcac263fe69c5a1f6425fdf9
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FE0 10664 bytes