Malicious PDF — malware analysis report

Static analysis result for SHA-256 961af4ca7def044c…

MALICIOUS

PDF

68.1 KB Created: 2020-09-10 11:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec795660d72090eb420ef5548f0f17ee SHA-1: ef072ba13a74faae12a55bb12c8a26aae3b5ca0c SHA-256: 961af4ca7def044c94137779b6a07cd491205a14539c416a88b7c75de7054a7d
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating a link to a known malicious redirector. Additionally, PDF_SEO_LINK_FARM suggests a large number of external PDF links, with the primary malicious URL being https://ttraff.me/wix?keyword=wave+music+english+songs. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the malicious URL.

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.me/wix?keyword=wave+music+english+songs
    • https://cdn.shopify.com/s/files/1/0432/2299/1007/files/55017522689.pdf
    • https://cdn.shopify.com/s/files/1/0463/3971/9324/files/rat_dissection_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3353/files/jajozerivujiveketotiwij.pdf
    • https://cdn.shopify.com/s/files/1/0428/0087/3631/files/basirazikax.pdf
    • https://cdn.shopify.com/s/files/1/0431/4005/5208/files/88685804296.pdf
    • https://cdn.shopify.com/s/files/1/0462/0415/8105/files/87925837772.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/desemomoviwifipodibewes.pdf
    • https://cdn.shopify.com/s/files/1/0433/7221/6483/files/python_import_from_directory_above.pdf
    • https://cdn.shopify.com/s/files/1/0435/0604/0992/files/12987865821.pdf
    • https://cdn.shopify.com/s/files/1/0450/6599/4392/files/market_leader_intermediate_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0440/0644/1125/files/nokawitujeloxu.pdf
    • https://static.usrfiles.com/ugd/b8c837_a98497e1b8d24f86be0b459402fb4a51.pdf
    • https://static.usrfiles.com/ugd/469aea_f67ec57e7af24e5cbb0e35145e0715aa.pdf
    • https://static.usrfiles.com/ugd/0cd019_cbdcf861038d4c248c8838a68775dd11.pdf
    • https://static.usrfiles.com/ugd/b48b60_151e32df70e1478697200c0a4f28457f.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_off0000cdd7.bin
250ea93c0f07c319641f9e46190944bd0d6c47b28e57a6eff4bf0840bf08fbc9
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD7 5192 bytes
font_01_sfnt_off0000df6d.bin
93ff37c5a999d24b88425fb1b9ccf8f2b0dd8664bcb4b6a2d0f44d8319b3927e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6D 10668 bytes