Malicious PDF — malware analysis report

Static analysis result for SHA-256 af509b35f83aa34c…

MALICIOUS

PDF

37.1 KB Created: 2020-08-10 22:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: eb876ffc23a7e753192d9c4bc97f1d54 SHA-1: 26a5ff17823dfeaef1dfa00cbfed550e6e3f5ecd SHA-256: af509b35f83aa34cde1578c0a977b2347602cf1a38e3a453608ba19adc89df7f
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.com/pify?keyword=healthcare+business+analyst+job+description+pdf In PDF document text
    • http://lujox.tbylaccessories.com/uploads/1/3/1/3/131383791/vasexof_sulija_gawina_fagafezamero.pdfIn PDF document text
    • http://files.christopherlaine.net/uploads/1/3/1/3/131380297/xufusuwumunatuvubajo.pdfIn PDF document text
    • http://files.webappinomics.com/uploads/1/3/1/3/131384071/3504154.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/1/0435/0086/3640/files/8720766062.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1535/6067/files/tool_10000_days_songs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31082235151.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9837/3285/files/games_like_meez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7879/3878/files/fodenupatovatibe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1535/5042/files/best_to_word_converter_online_i_love.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6957/1233/files/ruforativizarilanumaxu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8923/9969/files/filurosurotuzizelo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8799/4792/files/wowhead_blazing_drake.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_off000051e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51E2 5524 bytes
SHA-256: 4bbba72f8b229084d8033a0ba7c4b4d118c3c027d0eae1cd6720a2c5fa1e6a04
font_01_sfnt_off0000649f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x649F 10192 bytes
SHA-256: c791ebe07cffad1b6bf50a11d6dac89ae3f4a037f4467e66695ef8496b440592