Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd4a50a4c961d9a…

MALICIOUS

PDF

41.9 KB Created: 2020-09-08 18:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: c0807988514cbc5b5dbc761306c5d1a0 SHA-1: 0ab6515eb28fd17e72a47246cf00fe097bf8b560 SHA-256: 8fd4a50a4c961d9aee70cb550d3440d35eafdb71b0856687323a5cc669602128
170 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • SEO-redirector lure link (multi-word utm_term) low PDF_SEO_UTM_REDIRECTOR_LINK
    PDF contains a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the search-keyword gateway used by the 'free document download' phishing family. Surfaced as an IOC; on its own this is a low-confidence signal.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/wix?keyword=arabseed+internet++manager In 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/1/0432/9262/2998/files/25536095841.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/5118/8130/files/poptropica_download_mac.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6264/7191/files/97834117566.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/bicornuate_uterus_treatment.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/234f58_11b703253d8f47e4a791b15c82ffc0c2.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b7ab08_4a72be80f09c4ecc8e9a46c9b8f99dd1.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/67f5f7_3537e2126f2e40de9802953040af255b.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0698/3333/files/english_speaking_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1019/5605/files/97497312148.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2610/2947/files/jojilijonodifejabemuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6410/5886/files/arbor_acres_plus_broiler_performance.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3631/9639/files/xerekutunas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/61075798723.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0635/9713/files/stranded_deep_free_windows_10.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7876/9045/files/algorithms_algorithms_4_4th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/2515/9576/files/lavazavad.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_off00005d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D03 5240 bytes
SHA-256: 7a78aad162027b8a958ff2354827bf111e58a3bd57f5c9c08331f55ad4f7dd21
font_01_sfnt_off00006eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB7 13860 bytes
SHA-256: 1640d7097d0dc21b163363cd2c6770f6406ef178088bb9018ebaf8e6c54a9ddb

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