Malicious PDF — malware analysis report

Static analysis result for SHA-256 837198dc44f0bd45…

MALICIOUS

PDF

42.7 KB Created: 2020-09-01 10:39:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08254e2e0cf94c5d117b8d92849d9b5d SHA-1: f0aa28814eabe389cc4c6b7213f930d05763f1f4 SHA-256: 837198dc44f0bd4502d4d2730134a08304825acdc35302cb50dc35db6a16f459
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is a redirector that likely leads to further malicious content. The ML classifier strongly indicates maliciousness, and the presence of numerous links suggests a link farm or SEO poisoning attack.

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/pify?keyword=jasper+report++for+linux
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b7ed05_07ac49072c5040439a49a62ac268f570.pdf
    • https://static.usrfiles.com/ugd/09c3c7_b6b46666ea1b40968e0deb9dda151d93.pdf
    • https://static.usrfiles.com/ugd/b8c837_e61ca8ca5bbe4d16a1c09b3faeaadb92.pdf
    • https://static.usrfiles.com/ugd/9734e7_3571ff48774d464c97c66ecf318b95c8.pdf
    • https://static.usrfiles.com/ugd/b8c837_2dfd60b35f3e44b8b92fc60f917c2efa.pdf
    • https://static.usrfiles.com/ugd/808d8c_6239ba6f924847de929888a4c9004c95.pdf
    • https://static.usrfiles.com/ugd/34e21e_6e9a1ad1e26743c4b405872a65f90b04.pdf
    • https://static.usrfiles.com/ugd/23b571_84034c65d99249b9b6652ee5b5d8c8db.pdf
    • https://static.usrfiles.com/ugd/865d50_5b68b52412874d94a8779e795f127356.pdf
    • https://static.usrfiles.com/ugd/1cfe37_509a375a08094bca9b136a3edef7bd55.pdf
    • https://static.usrfiles.com/ugd/61804c_42565c2b4f664c73ad4a6b5af6b1ca61.pdf
    • https://static.usrfiles.com/ugd/cafc24_367ff7b3562148e3b99d90b8b3fbcae2.pdf
    • https://static.usrfiles.com/ugd/e5cbe5_2289355a2c8349aba1b8a2263e1a8ce0.pdf
    • https://static.usrfiles.com/ugd/b8c837_fbecc9a1d58c46e9b45e70e6f34fd5c9.pdf
    • https://static.usrfiles.com/ugd/7f46b5_54c76328156d45cea5f3744c5513da7a.pdf
    • https://static.usrfiles.com/ugd/6f7357_cfa07c8302894d20886cbfffbfe5a7ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_6371cab9a18e4de4afbad73d6b44d57c.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e07668e1ce740638d2bf153e34a7753.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006825.bin
323a3a1b1274be4f26b635f3e606e4ed29363d330f108894515a04741445d906		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6825 4952 bytes
font_01_sfnt_off00007913.bin
f68371c9405349218365421ccc890af31dfa6f082c5fc51a17d2f13920c29ec3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7913 10664 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.