Malicious PDF — malware analysis report

Static analysis result for SHA-256 c18aa26ae832d3f3…

MALICIOUS

PDF

48.0 KB Created: 2020-10-06 14:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 2dcd5ab4b60a5a3f99c0e73d16a18456 SHA-1: 32e5a6c09eb64faa067491a26a5314529078bcc4 SHA-256: c18aa26ae832d3f350cc4380ff90f5d4cea59e0f578a43af6758cb6d15ae6417
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=my+friend+pedro+trailer In PDF document text
    • http://tilut.gettreschic.com/uploads/1/3/0/7/130776031/7913969.pdfIn PDF document text
    • http://files.unitarianchurchcork.com/uploads/1/3/1/3/131383841/minoriwapiw_nosegemebavovo_vibusug_temisamigajuk.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/1/0482/1080/4890/files/restaurant_steps_of_service.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/2828/5093/files/jam_live_loud_earbuds_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4351/2732/files/andis_fade_master_guards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e01df9ab-b84a-49f1-a762-c95554c1fe38/20572803230.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa2c2bac-bd06-41b0-85b4-41fedf3c40ff/mugunipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1549f5ef-5c0e-456c-9eeb-bef3288ed2b3/66261070651.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/039e1799-d129-42de-9509-5d05657f408d/zexetesukasu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3035/9457/files/ap_euro_thirty_years_war_essay.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9018/2297/files/what_is_icnd.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8049/7817/files/switch_steal_unwrap_gift_exchange_game_cards.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/5491/5488/files/pebble_time_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/8690/6012/files/easy_spirit_mens_dress_shoes.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_off00007c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C80 4964 bytes
SHA-256: d88e2a9d6495b891c4e1ed2eedef974f333970359b90a88ca6912fe8f98434b2
font_01_sfnt_off00008d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D8B 11144 bytes
SHA-256: 8554d3d9a1e7a6a458a9b86ae3666e757945405fc13532507f8aa557c4481a8a

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