Malicious PDF — malware analysis report

Static analysis result for SHA-256 20684fbc515f4fa1…

MALICIOUS

PDF

38.5 KB Created: 2020-08-31 02:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc52668019b94f106e84dac66e0c39fa SHA-1: d7c4ce6456dd24aeafec66a66db3b3b58c0504db SHA-256: 20684fbc515f4fa11100e5509a025b35382368e3646d8873e724e8e348bc4101
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. It also contains a large number of external PDF links, suggesting a link farm. The ML classifier strongly supports the malicious verdict. The primary IOC is the redirector URL, which is likely used to funnel victims to a malicious site.

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.link/wix?keyword=tringali+vibrant+health
    • https://static.usrfiles.com/ugd/87fdc7_09249f6be2c446088e373cccd0de0c42.pdf
    • https://static.usrfiles.com/ugd/b8c837_40d1519768de4423a4f0c07f2cd1766f.pdf
    • https://static.usrfiles.com/ugd/b8c837_0bc6a4492a024c3e8a63f388d20d6214.pdf
    • https://static.usrfiles.com/ugd/eed56f_203715127889477a802daacff363163f.pdf
    • https://static.usrfiles.com/ugd/b9801a_85c5d2c413594a5790cd53e441df2140.pdf
    • https://static.usrfiles.com/ugd/1a89c8_62c78b881f85427d879ddf810c2aff7e.pdf
    • https://static.usrfiles.com/ugd/99965f_0a4f2f66919f4944b69196e16421f9af.pdf
    • https://static.usrfiles.com/ugd/b8c837_02fdf7ef2b034ecda35f0a51f9c8da88.pdf
    • https://static.usrfiles.com/ugd/b8c837_593548b0b5c1493f8bb286054310df6f.pdf
    • https://static.usrfiles.com/ugd/d216cb_d913801b046b4c288bc4eace9fc52fea.pdf
    • https://static.usrfiles.com/ugd/432b07_faf24094a13a4109b6940b29fd214f19.pdf
    • https://static.usrfiles.com/ugd/451a43_ac786352f7cd40adafd4c724753f14c1.pdf
    • https://static.usrfiles.com/ugd/ade4e6_9bcdcb90362a419198460325f729c0f8.pdf
    • https://static.usrfiles.com/ugd/4b68be_748b50ae87a249ba95e7321f7d19e455.pdf
    • https://static.usrfiles.com/ugd/96bf9d_6c32d8e2fb0d42f183753a02a838c43b.pdf
    • https://static.usrfiles.com/ugd/16a96a_9ba3341b9f2c4fd4bc0ec81b569be024.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c9b3ba46b3143a5a3cb622ac9fb4cc7.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_off00004b68.bin
6d60a50a4c9d13dffb92ac30a06e1845a72df8e5bf93a1f86b5fe5a86f4e771c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B68 4596 bytes
font_01_sfnt_off00005af6.bin
14820c675eb109e359cb0a0f0fd2e7973c178c7d02c044bb26e6892171253c8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF6 10304 bytes
font_02_sfnt_off00007d9a.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D9A 4324 bytes

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