Malicious PDF — malware analysis report

Static analysis result for SHA-256 311a839458d08c90…

MALICIOUS

PDF

45.6 KB Created: 2020-10-09 01:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 3bcd6721f29b0cd13bab1671b9d43f5e SHA-1: bdc1bf1d3b891eb74d406362ae993bbaa3334470 SHA-256: 311a839458d08c909e241185337f7119c7d604321f1742b60e8d136c86de27e4
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/pify?keyword=multicultural+law+enforcement+6th+edition+online+pdf In PDF document text
    • http://lupab.eygbball.com/uploads/1/3/0/8/130814339/1383403.pdfIn PDF document text
    • http://mavokobun.splchampton.com/uploads/1/3/2/6/132680835/dbbd12a.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/1/0484/8595/7782/files/flume_bon_iver_lyrics_espaol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4408/9255/files/vietnamese_vs_viet_nam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3393/1171/files/89095594855.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9313/1425/files/recorder_karate.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/7869/1237/files/total_gym_xls_home_gym.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1102/3270/files/thank_you_for_your_response_to_our_request.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/3223/5160/files/5_minute_bot_nxt_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8606/7352/files/70146601735.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0081/6028/files/ripabamevokabaxunafewara.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6445/8405/files/betodiregetifazavujopebar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7539/3946/files/unit_test_on_grade_6_integers_online.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_off000073f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73F4 5468 bytes
SHA-256: 6d342426d057202b5a9144871e411bbb1c05086ce215ef8b021f23a2354845f3
font_01_sfnt_off00008681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8681 10168 bytes
SHA-256: 0c61254605f9794893227d117e7b70f13df9bef67564619edd262ac9ec1ba39f

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