Malicious PDF — malware analysis report

Static analysis result for SHA-256 281fef23c113026c…

MALICIOUS

PDF

47.5 KB Created: 2020-10-15 09:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 8f92bdde7382a303b4ba94b1b4db9178 SHA-1: 94a9c51ac8aa8bd1f6bc8709d3b46c5e32d522e1 SHA-256: 281fef23c113026c73a4215bbd0c199921d3e1c514de6a0dae23f389a97da1fb
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://gettraff.ru/pify?keyword=tacheometry+method+of+surveying+pdf In PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/53e41d8972de40.pdfIn PDF document text
    • https://narogigadi.weebly.com/uploads/1/3/0/8/130874066/c2099e721b.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/5058540.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/27ea8efd8.pdfIn PDF document text
    • https://dedotomonifagax.weebly.com/uploads/1/3/1/6/131606429/2446307.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_5f87657687621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f8709c6bd42b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5f87e511c805f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_5f87ae3e13164.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/1/0476/9434/8454/files/remstar_cpap_machine_replacement_parts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4475/1528/files/37828707089.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1022/7876/files/kadozaselipofudame.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3417/1800/files/20677925580.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7806/7393/files/31376986665.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6499/0117/files/4598216149.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6542/1205/files/lectura_5to_gta_con_preguntas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9201/5787/files/best_riddle_games_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0567/6192/files/siwotejo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2730/0036/files/cant_help_falling_in_love_movie_ending.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4387/9594/files/gagujuved.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/5118/4028/files/pop_up_canopy_with_sidewalls.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/7158/1607/files/9_bonding_and_molecular_structure_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5020/3816/files/48896359667.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_off00007925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7925 5648 bytes
SHA-256: 253566ae40e099516f53a9b0a2f0a4cdf6772f9a4651222692719a3f92806f12
font_01_sfnt_off00008c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C48 10700 bytes
SHA-256: ac83a8f71fff2ddc740a36588b3d08473a154ee9252121309999399512b1e6ac

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