Malicious PDF — malware analysis report

Static analysis result for SHA-256 291ff10f1b44b207…

MALICIOUS

PDF

38.7 KB Created: 2020-10-30 08:21:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: dc86692f87646ae58d2d7426311c091c SHA-1: 71961ab93fd2564b07f6c507ee8103b370cb4494 SHA-256: 291ff10f1b44b2076ee868a82ea54575cc71962e194e1052c4955cf010e8ea1a
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://cctraff.ru/aws?keyword=writing+organization+worksheets In PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/6601931.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/1/0506/4327/1830/files/compare_editing_software.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/7365/2886/files/actuarial_life_tables.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/5118/4028/files/wiwunasudenuwajisupog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/0041/9267/files/brock_microbiology_14th_edition_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df99e4c9-6fac-46f9-ac95-da5448ed0363/36175931708.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6950/5187/files/persona_4_golden_new_game_plus_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/9751/9786/files/leadership_mastery_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d571127-aa6d-4d1b-bb52-ec335e521586/path_of_exile_duelist_leveling_guide_3.0.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0978/5499/files/gajagufejozudimukinaninim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9302/4149/files/hypertherm_powermax_125_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6147c46c-9be3-4a23-a340-864c7adeadec/55741134781.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/3203/9583/files/lumped_capacitance_method.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_off0000599e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x599E 5136 bytes
SHA-256: 806946ab4e8451d0f46d3528afac14700df86db15a149659c75f79ed9066c9ca
font_01_sfnt_off00006b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B36 10148 bytes
SHA-256: 61ac53378aceba6beffecb3065ec062e88b31026a95b3f0d878579c32c2bcd0c

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