Malicious PDF — malware analysis report

Static analysis result for SHA-256 84830e04508b9fed…

MALICIOUS

PDF

40.3 KB Created: 2020-08-29 01:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9f4ce0c198a714c80c40914d1353a69 SHA-1: 72582a543c367cbe927a95bba518e3f5f1441f96 SHA-256: 84830e04508b9fedc023be5bf6f5ab6c5381a551aeff2c104083dcb552a239a6
152 Risk Score

Malware Insights

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

The 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 heavily obfuscated, contains the URL https://ttraff.cc/wix?keyword=for+whom+the+southern+belle+tolls, which is also listed as a malicious redirector. Additionally, the PDF contains a link farm pointing to numerous other PDFs, suggesting a coordinated effort for SEO poisoning or traffic redirection.

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.cc/wix?keyword=for+whom+the+southern+belle+tolls
    • https://static.usrfiles.com/ugd/b8c837_b6707f0770c34f1da00a2010b54662c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_1866dd4e82ba4919bbc9956aab0c2f54.pdf
    • https://static.usrfiles.com/ugd/b8c837_44b0347737ab4394b3e02defa38c2303.pdf
    • https://static.usrfiles.com/ugd/b8c837_f3f4a0e144e5436d86d7252bc50e2254.pdf
    • https://static.usrfiles.com/ugd/b8c837_8eb7c0c4a5ac4d84ac2deba233118111.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/shia_labeouf_transformers.pdf
    • https://static.usrfiles.com/ugd/b8c837_50fe117e663543b1a93ec9e9748e6e84.pdf
    • https://static.usrfiles.com/ugd/b8c837_abcf35407fab42aab17ac4e20d9a7c69.pdf
    • https://static.usrfiles.com/ugd/b8c837_3660a2cb9bf04d14a9ef227cb72b6c90.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e138940fa5a4d36bc393f9bad6b77b6.pdf
    • https://static.usrfiles.com/ugd/b8c837_59314993d6cc4bf49b3ec87b9c1fab23.pdf
    • https://static.usrfiles.com/ugd/b8c837_20e37c5d833c42aeb7bbb095db66a8da.pdf
    • https://static.usrfiles.com/ugd/b8c837_964c2ae144f34a40bc95ae92fd1534ee.pdf
    • https://static.usrfiles.com/ugd/b8c837_30bda6cbade347fe9b4b4577d96426f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_f71dee7c754c49a1b475d2b705e2bff9.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_off00006221.bin
5ae0ba83a77ae1d98b30260f704d149caa36995b7a68adba0bbc4b95627971bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6221 4900 bytes
font_01_sfnt_off000072ba.bin
0e134d9c104740398ec2f25cabd7fe6c1e2268aa9c40727100f37277eb6b89b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x72BA 9860 bytes