Malicious PDF — malware analysis report

Static analysis result for SHA-256 407b5d727d9a134d…

MALICIOUS

PDF

41.7 KB Created: 2020-10-01 20:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: b7330283bb1483f769c675ca1ad6be7f SHA-1: d7ae0aaa5e376ea189fc6698bacf5554fe3beebf SHA-256: 407b5d727d9a134d8bf304ba24c2246fc003db40b2c2e4e1dabd1e3237353e61
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/strik?keyword=bible+download+pdf In PDF document text
    • http://kimeva.alantong.com/uploads/1/3/1/3/131379824/rufol-nupupov-bumaduropijazi-sanirusuxevor.pdfIn PDF document text
    • http://files.anabhra.com/uploads/1/3/0/8/130874317/447655.pdfIn PDF document text
    • http://zuvikimep.saginawbaybirding.org/uploads/1/3/2/8/132815028/7386314.pdfIn PDF document text
    • http://files.christophersaliba.com/uploads/1/3/1/8/131856567/5112738.pdfIn PDF document text
    • http://files.dhltaiwanconnects.com/uploads/1/3/2/6/132681300/29234c3fac7facb.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/1/0431/0119/2352/files/martin_hd_35_price.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5234/6777/files/83932994476.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5348/2138/files/69441424857.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/0701/6866/files/criminal_law_reviewer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/7115/4592/files/contraction_simulator_walmart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8359/4917/files/dajovarugijo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7812/3669/files/kexukavulugabevusut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2452/3159/files/council_of_wyrms_2e.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2026/2308/files/40850794277.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7369/0017/files/multiplying_and_dividing_exponents_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9818/0258/files/monofaw.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_off000065c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65C5 5040 bytes
SHA-256: ee06e9ed29a6e1ce6c45f416bf17e808b589b88df2e494073aab2a413b3b5839
font_01_sfnt_off00007714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7714 10292 bytes
SHA-256: 4f84bada7168d098ffc21629e0bdab1f9ff1398fff3e2457bd3cd12f268f9fe6

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