Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74fc0c99fa1e548…

MALICIOUS

PDF

79.6 KB Created: 2020-09-04 21:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26148f306d5dde9b3c49fc07a1090f6d SHA-1: 98212850dc8aeed4728888fc663304b17bd6ab9f SHA-256: a74fc0c99fa1e5481e3306602a8e71107b88ea4fcbd7401c7f764c8e085f9f13
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, identified as a PDF link farm. The primary malicious URL, 'https://ttraff.club/wix?keyword=r+a+s+full+form+in+english', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to a malicious site. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.club/wix?keyword=r+a+s+full+form+in+english
    • https://cdn.shopify.com/s/files/1/0437/6877/4807/files/60420768082.pdf
    • https://cdn.shopify.com/s/files/1/0428/5382/6726/files/edge_guide_foot_for_brother_sewing_machine.pdf
    • https://cdn.shopify.com/s/files/1/0436/5480/7717/files/hulu_error_code_p-_dev318.pdf
    • https://cdn.shopify.com/s/files/1/0434/1248/8343/files/sakenoxiwava.pdf
    • https://static.usrfiles.com/ugd/ace02d_adf208e28cb3446a9b921cffc8b38023.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_50136f8a66a645c9ba9fe9f0fc2fe7d4.pdf
    • https://static.usrfiles.com/ugd/e6092c_22db1ca1fd1443c3a25dfca5cb42ca63.pdf
    • https://static.usrfiles.com/ugd/47e66e_2103ab5f8d1c425f8b6430c6686f241a.pdf
    • https://static.usrfiles.com/ugd/b8c837_668e81b89e9741bb83929efce7f71966.pdf
    • https://static.usrfiles.com/ugd/ce77c6_dcde25e95f9441bd9ab40e8f8b905da7.pdf
    • https://static.usrfiles.com/ugd/3b6424_7ff17ab87ab84af9bdf36cac0b81dab8.pdf
    • https://static.usrfiles.com/ugd/9117e0_ef19fb55982c4322aa08a9d6ad1d16ef.pdf
    • https://static.usrfiles.com/ugd/2d797c_cde1c93f5ee6437f84e0414589657178.pdf
    • https://static.usrfiles.com/ugd/8de238_5072c7ca000042fdad71a67f6e3bdcd2.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 10

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_011_off0000fdae.bin
fad0d7aeaf0b9244787760f25420905377c02bfe855f9465f8fa73dc69f6a638		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFDAE 18480 bytes
font_00_sfnt_off00006a56.bin
09fa6184f3d5cae640738f073163ae8537f9e372588bd7fa8874dbfbf136ea1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A56 6964 bytes
font_01_sfnt_off00007bc0.bin
b417fcdd91c866d66510055d26f4cab2350d188c88305d7a1fb02c3c057fab56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC0 6156 bytes
font_02_sfnt_off000090ff.bin
96af3ff654f434ce04aa0da9db600a883650b2f813ceea65d6d56816c6e18dc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90FF 5188 bytes
font_03_sfnt_off0000a278.bin
dbaab8dcf32bfe64cb008f34eb54f5316f62236e8dffe3de49b44225404383a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA278 2656 bytes
font_04_sfnt_off0000ad7c.bin
c42118b51b061dffbc196cd4866a2cf76d9f31ae9d0a8f6c06e6ad224a677b24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7C 2328 bytes
font_05_sfnt_off0000b831.bin
806d12f4c18e044784d20764d58024893796e88f204c306662924b3e907cbcac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB831 2108 bytes
font_06_sfnt_off0000c1fc.bin
2da83060ad210a9a1743b04a22b2cc5ebb14ba7af64fbaa5f25da2d26a1b3d84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FC 6640 bytes
font_07_sfnt_off0000d39a.bin
08d66c651ca7bc0d432620bce7d92cae3e73f59690a81b010db75abd68a37756		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD39A 12616 bytes
font_09_sfnt_off00011b6a.bin
fde5d0e4017e29e4341e47da6b149bc5adc126b1d14c5bbfa8084b604aa6ef4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6A 5204 bytes

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