Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ee7d400e8fa7f6…

MALICIOUS

PDF

38.4 KB Created: 2020-09-04 21:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea4afa69cce88728de7bd172e056d70f SHA-1: 912e4a09a95fc87c4427a673e2f5278868fbba8e SHA-256: 51ee7d400e8fa7f6a1605ee7b9af6bbe882a21d185bae7d97d5c7c5b3f2ada5a
154 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 one critical heuristic identifying it as a PDF link farm. The primary malicious URL, https://ttraff.me/wix?keyword=bonbon+en+forme+de+fruit+dur, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other benign-looking PDF files, suggesting a lure to external 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.me/wix?keyword=bonbon+en+forme+de+fruit+dur
    • https://static.usrfiles.com/ugd/e643da_2b18755b4c54462fafdf3e74ec13cfd3.pdf
    • https://static.usrfiles.com/ugd/3be3a7_feb189aaf8244ce88a92b8ca02643c30.pdf
    • https://static.usrfiles.com/ugd/d79848_c8717b4ead0247e19353844f77d19804.pdf
    • https://cdn.shopify.com/s/files/1/0432/8239/9390/files/wekufixibijufawabewa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xigidewepiwunabifaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/5281/0911/files/reported_speech_statement_exercise.pdf
    • https://cdn.shopify.com/s/files/1/0431/5339/1780/files/felivizogifonopogu.pdf
    • https://static.usrfiles.com/ugd/ef7486_3dd18cc9fc72468a8aa7f836703b05e2.pdf
    • https://static.usrfiles.com/ugd/f8de3e_3d37e3f6646b42968f0f7e90271a1e14.pdf
    • https://static.usrfiles.com/ugd/a107db_0c4d81de868e4540bfb9b688184ef8ad.pdf
    • https://static.usrfiles.com/ugd/46429b_b00d487044e24a4b80614d3a096f80f5.pdf
    • https://static.usrfiles.com/ugd/2486b5_a34870f891974f7694fa0e7cdfb80e1a.pdf
    • https://static.usrfiles.com/ugd/b8c837_87f33e0bafed4d5fab536b8245b00c96.pdf
    • https://static.usrfiles.com/ugd/b8c837_bdf838f6053b4991886d3a1a2d6d2eaf.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057d3.bin
a770d082db6910a369ec682a639362d8daf774618e8aa91c9d7b03f5f72e59f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x57D3 4820 bytes
font_01_sfnt_off00006824.bin
1e9fcd40f044b3ff377686e4d6315065b8652b977cf4cc1dc2d4a2f76d5535b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6824 11748 bytes