Malicious PDF — malware analysis report

Static analysis result for SHA-256 1857b0d91b8ed6d2…

MALICIOUS

PDF

49.3 KB Created: 2020-08-30 07:40:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13ca8f9a60f06c0cb27bdd62249d6f11 SHA-1: f8794774d4d61a7b6fcb48227ccd1ff73ac17867 SHA-256: 1857b0d91b8ed6d228d70485aa33c8aa16f0974f464352c4da9aa33c6eeffff2
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a known malicious redirector. The ML classifier also flagged this PDF as malicious. The document body contains obfuscated text and URLs, suggesting an attempt to manipulate search engines or redirect users to potentially harmful content. No scripts were extracted, but the presence of numerous links points towards a phishing or content-farming attack vector.

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.com/wix?keyword=to+the+woman+i+once+loved+what+you+d
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/07ef24_f08ccce026914508a27b05a92b91a841.pdf
    • https://static.usrfiles.com/ugd/f80014_a3438215a0634a61ae1a6b2a53939e28.pdf
    • https://static.usrfiles.com/ugd/a382ee_30a51aca2190428fb8d04cd29f7c3345.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed11edce889742b6ad23190d87bdaf6b.pdf
    • https://static.usrfiles.com/ugd/ace02d_fd42748fa0c547a1ba1ecdb2e2c1de5c.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f40be5bc94947249c1abfbd6357f31e.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b16faab55ba4c7a80d348d2614ef614.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce9bef7a5b524514a2015b534cdf4826.pdf
    • https://static.usrfiles.com/ugd/913720_b9747442d2cb4e5aa77cb6d6496595ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_25bc10c4aeab49bfb623038ca7ad96a6.pdf
    • https://static.usrfiles.com/ugd/89064d_ead0931fbf2f4732a1eda8a958c679ad.pdf
    • https://static.usrfiles.com/ugd/3b7182_a71e7ce6fb9947178aee8fc31a609b35.pdf
    • https://static.usrfiles.com/ugd/12745a_c5781ce460d04b99970fc4f6b9b06d0f.pdf
    • https://cdn.shopify.com/s/files/1/0434/4191/4006/files/70331093129.pdf
    • https://cdn.shopify.com/s/files/1/0428/5667/7543/files/nixawabibumipalodama.pdf
    • https://cdn.shopify.com/s/files/1/0433/2634/1272/files/photosynthesis_and_cellular_respiration_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/26789170691.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000641e.bin
2c7cd5f2f11a8bec316bbdfb960a15d9537ebe85142ad8c8a58feaaf226c9f77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x641E 5108 bytes
font_01_sfnt_off0000756b.bin
4124f772d75de2e757d66273de45ab67d1472cce93aafc68bf24d7cdb8923c6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x756B 1964 bytes
font_02_sfnt_off00007ec4.bin
a428e18f532a9563b51352694667c296279fc03e11ddc875034472655fff17e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC4 10220 bytes
font_03_sfnt_off0000a1b6.bin
aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1B6 16312 bytes

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