Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d3bbc35e7c83fd…

MALICIOUS

PDF

40.6 KB Created: 2020-08-31 20:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2ebfa192574c87f1d923ce81c960693 SHA-1: 1d9ba47ee405bc0314b3fbd1544769f7db774e3f SHA-256: b9d3bbc35e7c83fda24454055f1502afe0c03aaed668e474c16707b21ba10706
152 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 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL and keywords suggesting a lure. The presence of numerous other PDF links, as noted by the 'PDF_SEO_LINK_FARM' heuristic, further indicates a campaign focused on driving traffic to external sites, likely for phishing or malware distribution.

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/wix?keyword=aurangabad+railway+station+time+table+pdf
    • https://cdn.shopify.com/s/files/1/0435/0440/2584/files/38360179547.pdf
    • https://cdn.shopify.com/s/files/1/0438/9991/2344/files/top_crowdfunding_platforms_for_nonprofits.pdf
    • https://cdn.shopify.com/s/files/1/0449/8168/2335/files/android_10_t_mobile_update.pdf
    • https://cdn.shopify.com/s/files/1/0433/6825/1548/files/android_seekbar_example_programmatically.pdf
    • https://cdn.shopify.com/s/files/1/0439/1760/7067/files/zawit.pdf
    • https://static.usrfiles.com/ugd/be19e1_833905343d1647879e3888d7a3a589d6.pdf
    • https://static.usrfiles.com/ugd/eda9ba_370be02a7a3e460cb81b71d34ae4e669.pdf
    • https://static.usrfiles.com/ugd/fd7405_91e3be84f7f84a018dfaa6965af14edf.pdf
    • https://static.usrfiles.com/ugd/e73fea_7b8d77103d22434c98fdd115bebbfe9e.pdf
    • https://static.usrfiles.com/ugd/c3f88d_1efaf02f2f3542fdaeb63d8831572b0a.pdf
    • https://static.usrfiles.com/ugd/f84671_dcbd7d5ed4d04bc1952a37aacfe1b547.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce9bef7a5b524514a2015b534cdf4826.pdf
    • https://static.usrfiles.com/ugd/3eed2b_d0a31e9c19654edf8d659afffa42fe31.pdf
    • https://static.usrfiles.com/ugd/b8c837_506f562396bf4f09bcbc7d1bd30129cd.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005377.bin
3113bc793d72acc26f16f7819b39705faf1c49a8d474b7489a34e64867daf2ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x5377 5684 bytes
font_01_sfnt_off000066d0.bin
2b10153ab19ddd1b9f395e94a864186f798e49552fdb7285363da0e1c4459d8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x66D0 10096 bytes
font_02_sfnt_off000089a0.bin
ee8afa51e50492bdf4d25b6b01818d2021856a0eb5271b70f188e6d094f25891
pdf-font-stream PDF embedded font (sfnt) at offset 0x89A0 2832 bytes