Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8d9339187e754e…

MALICIOUS

PDF

45.7 KB Created: 2020-08-30 20:40:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4e3c29fca91aae480b38c3665509ee6 SHA-1: edd1ab58cb1aa84e1394f5db579bdb981a33d7cc SHA-256: 4a8d9339187e754ef45aa89eb6c13b60611a766a878d16e7877c683d3f411fbd
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=springer+handbook+of+robotics+pdf'. Additionally, another critical heuristic indicates a PDF link farm, with numerous external links. The ML classifier also strongly flagged this PDF as malicious. These indicators suggest the document is designed to redirect users to malicious infrastructure, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=springer+handbook+of+robotics+pdf
    • https://static.usrfiles.com/ugd/b8c837_9c315e1065d446e2ae67cf8361e2fa41.pdf
    • https://static.usrfiles.com/ugd/6908d7_7c7b3c3181aa4bf08e60947ddf88b8f9.pdf
    • https://static.usrfiles.com/ugd/40512e_9cf5100c467343b8a089f611dccc1d8c.pdf
    • https://cdn.shopify.com/s/files/1/0436/1060/3677/files/vupukex.pdf
    • https://cdn.shopify.com/s/files/1/0430/0364/2007/files/fududaxutexan.pdf
    • https://cdn.shopify.com/s/files/1/0432/7299/4971/files/b_v_doshi_books.pdf
    • https://cdn.shopify.com/s/files/1/0430/1275/1523/files/raxijilefuju.pdf
    • https://cdn.shopify.com/s/files/1/0448/1361/5264/files/bologna_street_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/lawemosemegatatevubixeg.pdf
    • https://static.usrfiles.com/ugd/cc14e4_4df9bfba478f461d9eda3a7a9f7e03c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_bda09e0073e64be0915736abccfd8be7.pdf
    • https://static.usrfiles.com/ugd/de60da_327be4a45df245dd8fecffd3a16c41d9.pdf
    • https://static.usrfiles.com/ugd/1e4819_27e1058d22354b9cb6ab6f2551a17cfc.pdf
    • https://static.usrfiles.com/ugd/b8c837_004721e6029e43778513f5a4f5f0b2a1.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_off00007434.bin
f911fed58bf1cf2f1d25217a3e13355fb9b63b4e1ab3dfdb3bbd547ba6f69999		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7434 5692 bytes
font_01_sfnt_off0000877f.bin
bafe0f16718eb07ee9ace1e2fbc90de6d27910b66dcd00e8d8ae44dbd6da5473		 pdf-font-stream PDF embedded font (sfnt) at offset 0x877F 10084 bytes

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