Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c91f33012d15d25…

MALICIOUS

PDF

41.9 KB Created: 2020-09-18 09:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 46e23f59121c9b0e7523a9ef1785032a SHA-1: b1b86cacf64305b8e316ab7c46febe2af3a7cc9c SHA-256: 3c91f33012d15d25e15340c0392267cbba1400f5f106405626324d69ddf099b2
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.cc/wix?keyword=just+build+1v1+lol+unblocked 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/1/0432/6182/1092/files/alphabet_letter_practice_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4586/9985/files/zataruvirubabu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1102/9666/files/dezege.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/2323/1132/files/installation_guidelines_sla_barrier_pipe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0790/0835/files/31997433024.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6571/2541/files/xolosofujetarolumumebu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0903/1840/files/brick_colors_roblox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1666/7815/files/biwi_ke_huqooq_in_islam.pdfIn PDF document text
    • https://fff21958-4dd9-4c18-8d25-b37926dc4000.filesusr.com/ugd/0dcf4b_d5766192a5a340a487b7f0f1d76a9320.pdf?index=trueIn PDF document text
    • https://5e6d8c85-4ad1-4329-ab58-32496414429c.filesusr.com/ugd/7be1cd_9d0c71a8f72147bc820a04dc7342fbc2.pdf?index=trueIn PDF document text
    • https://caf90a9e-668b-4bf9-bab5-3605a9d878b6.filesusr.com/ugd/cbdbb6_3a739d4ff4d54487acc5dcde06170765.pdf?index=trueIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2496/5019/files/jeravimimipiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1509/3924/files/85581334959.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2397/2005/files/vumozaludavimepo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5627/3310/files/suzukome.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8561/0651/files/clip_art_borders_and_frames_free.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_off0000673b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x673B 4932 bytes
SHA-256: 10d43e3afa1296fa82fcad75822a36a75c71dae729f6bda6d1abd30dd84f3cae
font_01_sfnt_off00007824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7824 10060 bytes
SHA-256: b1b2b77e3c92d54ec59f6efbbab20939bb2eee27b86667918a73cc518e00e8ce

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