Malicious PDF — malware analysis report

Static analysis result for SHA-256 e521b326e4f9e6a1…

MALICIOUS

PDF

53.9 KB Created: 2020-10-29 22:39:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: ff0383b5a2e5cc26677be8aa80099ca7 SHA-1: 65ed327472291e3cad7e93d46691b4b573da399d SHA-256: e521b326e4f9e6a148b1afe37551b32a4eb6d25e36fc5faa7f372534ee003777
134 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/123?keyword=usps+3600+ez+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367950/normal_5f885a5ba9cdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371800/normal_5f8a60d2a7c01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368977/normal_5f8a813fca898.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5f870e0fd62fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0503/3171/3694/files/almacenamiento_interno_de_mi_android_lleno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4739472b-0aea-4a8c-95c9-658663f29d66/devib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/7946/1785/files/jirubenopaxexoziwadovu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8021/3170/files/sobefo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/5732/9350/files/sanskrit_grammar_book_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/apprendre_le_chinois_mandarin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/4255/4015/files/magic_bullet_parts_diagram.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8127/8660/files/82030670682.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2827/4582/files/feberepemoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c53e3ed0-b931-45a6-88f3-c87560da08ec/the_law_school_admission_game.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/bifobanuxoxinixuzufodox.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F33 4552 bytes
SHA-256: fd55f7a2a9e28d73f7d248526e57b6e56096a44d95ef0987fc7941b07e182839
font_01_sfnt_off00007ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA6 12052 bytes
SHA-256: 0ce6e05b442a9e7d68a75d7a0c3584a75bb5a7c9d01e5ff996cb5fccaaf6d55d
font_02_sfnt_off0000a769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA769 16140 bytes
SHA-256: 3f83bbfb2e03141a9083badfb1da6e2b1773f9aa6b1ed8f30fc2d392a5ee3553
font_03_sfnt_off0000bc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC67 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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