Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c16d389037338e…

MALICIOUS

PDF

39.6 KB Created: 2020-08-25 00:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: aa2c7b3cc2ca2e2b0cd6d8457906c7bf SHA-1: b56e9876ae9c40e43e53bd63559973f191496ad5 SHA-256: b9c16d389037338e30394ea68f30a3aa3dfadb02bcf9e25ea736a0e77d831424
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.ru/pify?keyword=chemical+equation+worksheet%2523+2 In PDF document text
    • http://sipoxemuf.abonart.net/uploads/1/3/2/6/132682883/vajuzoja-jukavojomekomi.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/1/0436/6349/1222/files/4597080946.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1271/6704/files/white_blank_page_piano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8691/3431/files/67481194305.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9452/4579/files/wpf_binding_path_format.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/68876684382.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6072/3865/files/45838295537.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2491/5359/files/beko_bxif22100s_electric_oven_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9492/4694/files/benefcios_da_biomassa_de_banana_verde.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/6778/8703/files/create_custom_listview_in_android_studio.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6657/2452/files/azar_elmas_hilesi_apk_2018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9068/2783/files/xojabonomunitesabemeref.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_off00005cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CF0 5224 bytes
SHA-256: 268cb0686026db77716f30ee1623833791cc5b72c51c19b4096923a5c0470d73
font_01_sfnt_off00006e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E99 9840 bytes
SHA-256: ec65faab9a963e815a0c246d3963e0a5f9aadc3e7d25651fce1b8ad5b55d00a9