Malicious PDF — malware analysis report

Static analysis result for SHA-256 795cf8a788b26655…

MALICIOUS

PDF

34.4 KB Created: 2020-10-23 15:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 1dfe8fc135ef6cafa1a71508f1da1172 SHA-1: c82e03985dd4a4cffa536c3303c2e2d1e39fd59e SHA-256: 795cf8a788b266555f36405ff9a0e8a780f970911b7dada3136c96c2f259e94e
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://ggtraff.ru/pify?keyword=crash+reward+win+prizes+apk+download In PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/9973104.pdfIn PDF document text
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/239ea139ac73931.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385410/normal_5f90afe168578.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369632/normal_5f9155ca20b7b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9087/9676/files/girafowenavemonariromijab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5834/7688/files/kruphix_eldrazi_edh.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9116/5333/files/digital_marketing_project_report.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6590/8123/files/71106870251.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3592/1064/files/manual_del_usuario_del_ipad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6091/9965/files/the_outlived_mod_apk_1.0.7.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/anemia_gravis_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/byronic_hero.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/8650/1806/files/gargantua_si_pantagruel_cartea_a_treia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9816/7709/files/peralatan_bayi_baru_lahir_yang_harus_disiapkan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/8352/9885/files/spanish_adjective_agreement_worksheet.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000494b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x494B 5156 bytes
SHA-256: 0567bc364b5b4bc67741dcc8041458082ef8240f17b2a7a2d46da7d47a8e14a5
font_01_sfnt_off00005ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AE0 9920 bytes
SHA-256: f21dfb17937de7cf652f2f540f9fec6067812b0e2a74d7df5078e9bfeaa81296