Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c19810816c88993…

MALICIOUS

PDF

43.3 KB Created: 2020-09-04 08:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cba8270744d585bc4dff5a51a8bbf9da SHA-1: 79f071dd4b37664261d5e5fa1d9b29c49a7db23f SHA-256: 8c19810816c88993ddb7fa09448b7fc6f590c3ae3a1ae9b7e3a37df1d8e1fad1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains the URL https://ttraff.ru/pify?keyword=hobbies+and+interests+on+job+application+form, which is likely the primary malicious payload delivery mechanism. The file also contains a large number of embedded links to PDFs hosted on static.usrfiles.com, suggesting a link farm or SEO poisoning 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.ru/pify?keyword=hobbies+and+interests+on+job+application+form
    • https://static.usrfiles.com/ugd/b09e1d_8b563846a25943d38732029dd92cba1a.pdf
    • https://static.usrfiles.com/ugd/26481d_fe78ffcd4972482e814d2023de7af546.pdf
    • https://static.usrfiles.com/ugd/5befcb_3f94686fdc1446c9aee1071091287495.pdf
    • https://static.usrfiles.com/ugd/0a052f_d1f80ce3b3db4eae8326264b00233c31.pdf
    • https://static.usrfiles.com/ugd/cc03df_1de2e4e63f934b9da40ce41b258732fe.pdf
    • https://static.usrfiles.com/ugd/ab63e3_a42787483c4f4865b6bf9f991f032b91.pdf
    • https://static.usrfiles.com/ugd/22bf55_83aa8295aa854a0f943d137f906772d8.pdf
    • https://static.usrfiles.com/ugd/628a76_3dfb240611b74f359abe6d1f6689470c.pdf
    • https://static.usrfiles.com/ugd/c83fdb_a1099c0c88ff41f893089bcaf7595e3f.pdf
    • https://static.usrfiles.com/ugd/4b7290_da43a1b177c64c85861b156111a593d8.pdf
    • https://static.usrfiles.com/ugd/2a2e94_fb4b79dfba6b4d37a1c39b91214d263c.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63529720688.pdf
    • https://cdn.shopify.com/s/files/1/0433/9888/9635/files/tokawinijidefenolekerim.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/kipofaximuxuxom.pdf
    • https://cdn.shopify.com/s/files/1/0459/9781/8015/files/percentage_increase_and_decrease_worksheet_gcse.pdf
    • https://cdn.shopify.com/s/files/1/0431/9671/1073/files/benefits_of_agroforestry_practices.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_off00006be3.bin
3c15037e9beec75cb0058039073b8c24647c4c13b7462baec99f4ec5e7babf8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE3 5476 bytes
font_01_sfnt_off00007e69.bin
1a5c62e659e5a1ed15cf3a0bf1cb728fb990fdf9921368babb78074c42454786		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E69 9872 bytes

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