Malicious PDF — malware analysis report

Static analysis result for SHA-256 363cbfb31eca5d98…

MALICIOUS

PDF

44.0 KB Created: 2020-08-31 18:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 142d881316237e13bb76c8dd8e4322cd SHA-1: 50fd32a83c2b53de36f409d0e7806fe1ec1db7a1 SHA-256: 363cbfb31eca5d9892e09a34278c789fee7406316e5e41010f25a42b5cb6b944
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains the URL 'https://ttraff.cc/pify?keyword=present+continuous+for+kids%252B+worksheet+pdf', which is likely used to lure users to malicious sites. The presence of numerous links to static.usrfiles.com suggests an attempt at SEO poisoning to drive traffic to malicious content.

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/pify?keyword=present+continuous+for+kids%252B+worksheet+pdf
    • https://static.usrfiles.com/ugd/269bb8_7abb8ded0c49435b83830ce3c31adf70.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f8b9d94ec0b4a0fae69286722a40717.pdf
    • https://static.usrfiles.com/ugd/3de8a6_50d593f41bd04584b6e2755f98e22915.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0d49d69eef344cbb6e2c31d3fe5b593.pdf
    • https://static.usrfiles.com/ugd/b8c837_b66af327c13643228fe2a10cfe26f05c.pdf
    • https://static.usrfiles.com/ugd/54fa57_6a7c00824ff548869279ba31f06cfbe0.pdf
    • https://static.usrfiles.com/ugd/b8c837_92488ebecacd42a48bb8969f0ff89d03.pdf
    • https://static.usrfiles.com/ugd/1849a1_61c52e97d9744cca92301de5a3a9dd06.pdf
    • https://static.usrfiles.com/ugd/269bb8_3ba3e244bdd84c7d860acd46cbf22562.pdf
    • https://static.usrfiles.com/ugd/4b7290_5e7fc12081574cf99364a426364be86c.pdf
    • https://static.usrfiles.com/ugd/b8c837_fffc3add1a194ecb8ad92f23bd26b7d5.pdf
    • https://static.usrfiles.com/ugd/1e4819_11e2ab330cf34c889c6f5db3c71085ed.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ca733eb7ac848cf887eb8202189f8c1.pdf
    • https://static.usrfiles.com/ugd/ba3095_3b55b0848c7547cd95563600a20882d7.pdf
    • https://static.usrfiles.com/ugd/5ad03d_bfecec1ec3e94d25abbea83f5fe907ed.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_off00005fa3.bin
7d520671dde4885f6365927a646aae71876ff61c6292dc7d19b29b163f559620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA3 5040 bytes
font_01_sfnt_off000070d2.bin
b80c25f20c5e140248ea798b173e4304e55cf364e467df7e2784a6291ec180a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70D2 10480 bytes
font_02_sfnt_off000094b6.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94B6 4324 bytes

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