Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d7cc0876d30f33…

MALICIOUS

PDF

47.1 KB Created: 2020-11-04 03:50:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 34a0fe902a66e507f8dea26dd4dc4441 SHA-1: b3f70c6c0a68426dc78bc08dc2d6dea3aa3e03f3 SHA-256: 65d7cc0876d30f3342a2e320dcf3eb4c866a5f0f836d3923996d28af111def3b
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.me/123?keyword=angle+worksheets+basic In PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/gidofokalesifudelo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc7ae36-8e42-4242-a335-0a2a5d0046ce/mugopotisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/141f7ceb-7067-40c5-bd4c-27cdc86c272b/45686574620.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/cooks_12_cup_programmable_coffee_maker_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/ina_cylindrical_roller_bearing.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/form_8916_a_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9778/7035/files/scaricare_curriculum_vitae_da_compilare_in.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20ecb25b-ff8a-402d-a429-fa82fbe2aa62/guwubupevedujifebina.pdfIn PDF document text
    • https://s3.amazonaws.com/sirasu/bbc_planet_earth_pole_to_pole_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/spider_man_apk_data_mod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/8303/6309/files/sun_joe_dethatcher_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/carcinogenicity_studies.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_off00007885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7885 5348 bytes
SHA-256: 9fda401fda6f69b05fc650ed69d328294a619fc083615bf942a399a9d1f0315f
font_01_sfnt_off00008ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC9 10796 bytes
SHA-256: ba9e3af0ac945fcefd82fa17b76616f1e091b90c2ac72c3b15ec4775c9d43f18