Malicious PDF — malware analysis report

Static analysis result for SHA-256 684d6fd13c5abaeb…

MALICIOUS

PDF

52.6 KB Created: 2020-10-25 21:19:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 2a92105732505b12928195124ff241d6 SHA-1: 6f354c9b9e28f79c215312bb3e9f33878bda02e4 SHA-256: 684d6fd13c5abaebfaae6d9c33ed335076574a30db2f24beb4f7c3821c29f2de
202 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.
  • 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.
  • 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.link/pify?keyword=maths+formulas+for+competitive+exams+pdf In PDF document text
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/5928710.pdfIn PDF document text
    • https://nixofukotozawe.weebly.com/uploads/1/3/4/3/134313466/xebavedagunekifol.pdfIn PDF document text
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/tewulapugofuxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391599/normal_5f8f696d9b082.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368758/normal_5f89a511d105f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388598/normal_5f8db5ceb6120.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371800/normal_5f8a7e6c9a6c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366654/normal_5f8e58a230e59.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00006d61.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00006d61.bin)
    • http://fedorahosted.org/lohitIn extracted file (font_02_sfnt_off0000aa01.bin)
    • https://cdn.shopify.com/s/files/1/0429/5029/5708/files/weeny_free_word_to_converter_2.0.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/1886/9665/files/half_moon_bay_high_school_bell_schedule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/3264/3237/files/novum_organum_ita.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8613/8532/files/71449528204.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e18ba0b8-f57e-425d-ba36-82894b2ccc0f/kisenokunufebuso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b4fa07b-cc55-4dfd-a2d7-38ad6bd028dc/tuvalapunus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db16d26f-7d80-4307-8724-7c0db0e29a66/95936800698.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9315/0875/files/hall_tree_with_mirror_antique.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1856/6306/files/flour_bluff_school_library.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0607/3759/files/53855066644.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2722/7036/files/small_country_towns_in_south_carolina.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4378/9727/files/49039167111.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 extracted file (font_00_sfnt_off00006d61.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D61 5528 bytes
SHA-256: 261bf414eea41064fb175628bf533e4d2403e51b336e44620d9ee172e22f3bcc
font_01_sfnt_off00008018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8018 12252 bytes
SHA-256: b7887a1abc8eb7f5f2184ac4583efbcf98a999f738e8fa9630a8cb1cad72a914
font_02_sfnt_off0000aa01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA01 7912 bytes
SHA-256: a254b372fac3d4883f594544272b2659a2fbd98b7a5875278a18acb47f7c1459