Malicious PDF — malware analysis report

Static analysis result for SHA-256 2da37e1a7f7d3b2b…

MALICIOUS

PDF

44.8 KB Created: 2020-09-30 01:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 71e7746963eb4126cc2a9b4ef8e66855 SHA-1: 7750e64ea039e74ef0872fea8ee7246d93a3fd8d SHA-256: 2da37e1a7f7d3b2b12ed7237bdaa953bc42b55018758d5835b8ed16dd889be7e
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://ggtraff.ru/strik?keyword=addition+with+regrouping+worksheets+grade+2+pdf In PDF document text
    • http://files.thefarmonfishmarket.com/uploads/1/3/0/7/130739376/xosipeziwofebir.pdfIn PDF document text
    • http://files.jenniferbmoore.com/uploads/1/3/0/7/130740429/sadexafalapoxel.pdfIn PDF document text
    • http://files.gaoe.org/uploads/1/3/1/4/131437728/8552724.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/1/0428/9875/1641/files/schwinn_470_elliptical_machine.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9693/2505/files/the_voyage_of_the_dawn_treader_2010.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0463/2998/files/causes_of_mental_illness_in_nigeria.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dijupabexapuvasazanuripik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/5491/5488/files/t_torrent_pro_apk_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8618/3577/files/bhangra_dance_songs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8000/6294/files/tiluzavowenujivibobusasim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1442/2677/files/83502311634.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0595/9588/files/46378150216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17c1db8f-3ce5-4140-a220-8d9ed87034b5/83044038687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/411e707e-4b52-4738-8c2a-fd0b8d634a85/98111993435.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd798489-8703-45da-a270-0f2b05f1b320/fuzirolixeles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3601df2-502f-4238-a1db-ce4807ecab1f/jikowod.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_off00006fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB6 5548 bytes
SHA-256: 4e3461c096f1453a6deacbdfb4b6844f5924cc4ed1b7d501b9d35351bbee2121
font_01_sfnt_off000082a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82A7 10372 bytes
SHA-256: a2ea52333e810d597d5f7fa078891fc3743b574c4eea8e541a0b987179709fb1

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