Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3835e4eba1af361…

MALICIOUS

PDF

44.8 KB Created: 2020-10-01 01:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: 55feaccd1fd68d14148eef6a769ff7d0 SHA-1: f0d689fb17d6b32fad7f306cf7d19868e400ec5e SHA-256: a3835e4eba1af361ea658d741daddb3675f7138368e93f99cd39ac0bf529bef2
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/strik?keyword=beneath+this+man+pdf+free+download In PDF document text
    • http://files.discountduniya.com/uploads/1/3/1/6/131637136/wifavofokatanivo.pdfIn PDF document text
    • http://luwude.quantumae.net/uploads/1/3/1/3/131379856/5927115.pdfIn PDF document text
    • http://binafo.arkangelcreations.net/uploads/1/3/0/8/130874284/dugukinep.pdfIn PDF document text
    • http://mapudoga.vetticattgroup.com/uploads/1/3/1/4/131483468/f58cd59568192.pdfIn PDF document text
    • http://lerovuju.prismbehavioralconsulting.com/uploads/1/3/1/4/131453630/5161364.pdfIn PDF document text
    • https://site-1036753.mozfiles.com/files/1036753/56095800552.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/99728c65-1320-4481-96f9-bf46196f7700/mumunuzakorupidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04fa285e-9109-4e81-90f2-f6bf8a6067d6/zabobezozezu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4007/9005/files/kegox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7183/1193/files/xifimuzesum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2711/1841/files/chemical_bonding_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3485/9930/files/guwuvivasojabamakejores.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0106/7166/files/tazog.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_off000072ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72AE 5424 bytes
SHA-256: abad092ed95f2a8129721cda5691ce0ae34691d82da6049b87881c729f2c8f52
font_01_sfnt_off00008504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8504 9752 bytes
SHA-256: cc8f7e12be236992dd4ffa7a5163bf3a243c2e3d9eea5fa8a988cf266280976e