Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35da079ac8eb8ee…

MALICIOUS

PDF

43.5 KB Created: 2020-09-02 02:39:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b6925ddcc69b6838b30081aa32d805c SHA-1: 195ceec0ccdd25467bd8b4ee87937c6f9d777285 SHA-256: f35da079ac8eb8eef7f74abeaa31f3bc19645189de94019b2119e525f684aae6
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, characteristic of a link farm. One of these links, 'https://ttraff.link/wix?keyword=inama+dance+challenge', is identified as a known malicious redirector. The presence of this redirector suggests an attempt to lure users to malicious content. The document body itself is heavily obfuscated and contains the same redirector URL, reinforcing the malicious intent.

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=inama+dance+challenge
    • https://static.usrfiles.com/ugd/5d2cf3_e694c9a8db094db890c14ccf5c3d9fe6.pdf
    • https://static.usrfiles.com/ugd/0aab01_bb5a0464a98c451295dc4f23fa8e670d.pdf
    • https://static.usrfiles.com/ugd/87a178_d5fff33b611044d3a13452598dd52cdb.pdf
    • https://static.usrfiles.com/ugd/739437_2f0f4b0fdd394f7b899ed7ec49247513.pdf
    • https://static.usrfiles.com/ugd/73f3b0_278301a3ea8d47469c1c958f22587afb.pdf
    • https://static.usrfiles.com/ugd/63022f_9179ca3c87f84bee8bf503ca8fd52dd5.pdf
    • https://static.usrfiles.com/ugd/cafc24_274b520386a34f4299ce0d3195d06236.pdf
    • https://static.usrfiles.com/ugd/b8c837_b65c760b31a648a095036790a0873184.pdf
    • https://static.usrfiles.com/ugd/7baf93_30182ae7a7e843048fc50da78fa3eb7e.pdf
    • https://static.usrfiles.com/ugd/eb6612_90ef8740966145e48b0f361a8a402a9e.pdf
    • https://static.usrfiles.com/ugd/b8c837_e1973744e4844790b9d1f559f1a097b0.pdf
    • https://static.usrfiles.com/ugd/9e41f0_540040857af94b2fb44cabd4d9151e05.pdf
    • https://static.usrfiles.com/ugd/b8c837_2010f912381441b5922af6398d0e7fb7.pdf
    • https://static.usrfiles.com/ugd/b91566_53c2a449c09f470ebd388076a8176fea.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_off00005f92.bin
51d4009c7db47bad162c7b2838f2e447d3d421227b027e4f2cdf341d0d0e4ad0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F92 4568 bytes
font_01_sfnt_off00006ecc.bin
3c90ec4ada5b6d84f4df9a2ea4b38d6d69958f53d286b38d53e17ef1c9d34ae2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ECC 10948 bytes
font_02_sfnt_off00009373.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x9373 4324 bytes