Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fbb193624b78f5a…

MALICIOUS

PDF

47.3 KB Created: 2020-08-06 18:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4f84901d90b34d7b50891d9d00ba855 SHA-1: d75e06fe4adf293a849d3f37d06e669bc2d45472 SHA-256: 6fbb193624b78f5ac6f64eef0b71be5ea57469e423b8d564bbdc5a6aed8d1f63
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed for SEO manipulation. One prominent URL, 'https://ttraff.ru/pify?keyword=interviewer+preparation+before+interview+pdf', is identified as a malicious redirector. The document body, though partially obfuscated, includes text related to interview preparation, suggesting a lure to disguise the malicious intent. No scripts were extracted, but the heuristic firings strongly indicate a malicious redirection attempt.

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.ru/pify?keyword=interviewer+preparation+before+interview+pdf
    • http://files.gcpsbookmobile.org/uploads/1/3/1/4/131453651/fe0fbed7.pdf
    • http://files.lunacatfluencer.com/uploads/1/3/0/7/130776592/sumikuken.pdf
    • http://files.lerevepianos.com/uploads/1/3/1/3/131398219/konureruxenajegado.pdf
    • http://files.cimeron.com/uploads/1/3/1/4/131454116/xijekofatepesim_lejimatofuz.pdf
    • http://files.justbreathetravel.com/uploads/1/3/0/9/130969241/wowome.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/2538/2051/files/blkoviny_chemie.pdf
    • https://cdn.shopify.com/s/files/1/0435/1623/1840/files/enteropathogenic_e_coli.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/libidurekatomanazavevufi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/voriwedaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/4809/2323/files/arbol_de_decisiones_ejemplos_resueltos.pdf
    • https://cdn.shopify.com/s/files/1/0437/8171/8165/files/gastrointestinal_motility_disorders.pdf
    • https://cdn.shopify.com/s/files/1/0449/9108/6750/files/aerodynamics_book_anderson.pdf
    • https://cdn.shopify.com/s/files/1/0433/7205/2643/files/mmt_grading_scale.pdf
    • https://cdn.shopify.com/s/files/1/0433/9289/3093/files/104046800.pdf
    • https://cdn.shopify.com/s/files/1/0433/2450/6266/files/nevuruwejide.pdf
    • https://cdn.shopify.com/s/files/1/0437/9394/0629/files/cadena_de_suministro_ejemplo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luvibuxunefipefijuli.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8090/files/nekezejekaxufalasuxaxuki.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c3d.bin
6cdc52d81cb1dbf473f2d3dcf80092c03501ab3d061b2c9a121b514d2fe83d32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C3D 5056 bytes
font_01_sfnt_off00008d8d.bin
05a3afbae5f7756c694e6e34a0fa9d016b34649bcf819d2cb324883d2e5bb12a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D8D 10148 bytes

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