Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91bacb2a8c0c1d0…

MALICIOUS

PDF

47.4 KB Created: 2020-08-11 08:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 13bc5a81041c4e4b505920be832c55cb SHA-1: 5c9748cd4e7b29d61d52e7dedcc343c045afac0a SHA-256: d91bacb2a8c0c1d0bc41eb445d8ae2a96be58dfdf48b724da1e8dd9288481481
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://ttraff.ru/pify?keyword=ancyl+membership+form+pdf In PDF document text
    • http://files.newlifetabernacleupc.com/uploads/1/3/2/6/132681199/9358714.pdfIn PDF document text
    • http://files.mariemedhair.com/uploads/1/3/1/4/131407435/raxirusafa_watujuvipos_vagopebonefeni_getoxikiletozes.pdfIn PDF document text
    • http://files.harborbaychiro.com/uploads/1/3/1/8/131871433/ad9aaba.pdfIn PDF document text
    • http://files.foeesp.com/uploads/1/3/1/4/131438616/4615753.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/1/0447/3644/6613/files/momentary_time_sampling.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6296/0023/files/belanumimidigazejeta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4024/1829/files/cagliostro_vicente_huidobro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57955619809.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9235/1907/files/17895858581.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2388/2664/files/19025600943.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7281/4245/files/52874826528.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8275/2935/files/50020745708.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3714/7804/files/bombastic_words_and_their_meaning.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2931/5229/files/kubed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9664/6556/files/gosebuberinudexe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4782/8133/files/matlab_fourier_transform.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1877/9815/files/kigipinegilobujovenobaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8695/4140/files/vutufu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1448/7207/files/bowflex_revolution_exercise_chart.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_off000077f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77F3 5416 bytes
SHA-256: 2b2c87aaf6aff7e78ca702314839a2d7ad6db0776be1f31d32c5e26130f6c433
font_01_sfnt_off00008a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A26 11916 bytes
SHA-256: bbf1b2e6719992b4641c0f16209f931289ee7da1a404b71e01db6e45ced8ac69

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