Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c692ba0c3b1e630…

MALICIOUS

PDF

48.9 KB Created: 2020-09-20 10:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 3bf0a2ed78e7b187ec8377e519fc7593 SHA-1: 701fee491622662c7b28f120e3a315630de5e034 SHA-256: 4c692ba0c3b1e63068556c4ed9cfb8615b2393016f735376dcb3a22d48844f3f
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.link/wix?keyword=block+city+wars+apk+download In PDF document text
    • http://files.freerangecafe.co.uk/uploads/1/3/1/8/131856173/vaworofawife.pdfIn PDF document text
    • http://files.maritimereunion64.com/uploads/1/3/1/3/131379266/bemidonuvirimu-wolerobu.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/1/0433/8099/8298/files/ballooning_drawings_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6923/5619/files/gixidij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8581/5194/files/always_on_top_script.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8221/1735/files/how_to_sort_a_dictionary_in_python.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8439/8236/files/adventure_time_moba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7135/4533/files/21292500674.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6045/3791/files/calibre_quick_start_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4852/5206/files/37088679239.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/9808/0157/files/add_print_button_to_html_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5538/0630/files/guns_of_glory_mod_apk_revdl.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6327/8758/files/bopewomujadusajexi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0453/4692/files/popugolodizi.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_off00005a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A5F 5212 bytes
SHA-256: 4ba9bd68e942de097b5462249ce334e07e07221ebef5c2d81005a2b3518b8edb
font_01_sfnt_off00006c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C95 5376 bytes
SHA-256: ae3d14fd505b189f5d86864c10426de7f7a11a35de89b5d5b8b258049f47b5ae
font_02_sfnt_off00007f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F0E 9912 bytes
SHA-256: b2dd1b05a0709e09290be73a965767f852fd263ca9871945b5cf79f78763e3d6
font_03_sfnt_off0000a147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA147 16108 bytes
SHA-256: d71c496d466aeab3acc6a7caca1ccaec7f1463641586ce61c96e6220b6163366

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