Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ff2678dffa0063…

MALICIOUS

PDF

37.9 KB Created: 2020-11-09 02:41:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: c52d481686005e99eee2ee9a61db37e4 SHA-1: e9c1f78edd82ae8c6a8bb6e16c349652f86647cc SHA-256: b5ff2678dffa006389f91c48890bb2f9efacd906742efce36eb786735eb0ae1c
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://traffmen.ru/123?keyword=unblocked+games+happy+wheels+full In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5f8762fad45ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372707/normal_5f8e342039f7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366367/normal_5f99d5d946a10.pdfIn PDF document text
    • https://bavobero.weebly.com/uploads/1/3/4/5/134585538/tapomuje_zedobuxegonom_wibebudid_naluwilalujat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369900/normal_5f9439f3bf489.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zalomi/panda_bears_cubs.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/44192874466.pdfIn PDF document text
    • https://mutozofe.files.wordpress.com/2020/11/65548376527.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/jebusipivukun.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/fepapa.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/vepejakezivorukavokozas.pdfIn PDF document text
    • https://pufelaneniw.files.wordpress.com/2020/11/gofewotizujidewa.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/dictators_handbook_summary.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_off0000598a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x598A 5864 bytes
SHA-256: 64b18e03c9a11b8acd98e8b3556bf915270df659359cb79f6afddf9c4065b05c
font_01_sfnt_off00006d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D77 9124 bytes
SHA-256: 0a4148d569ae6c5448faf593bf5efd836ce5534e7a7ea550fb31669a21c9b96a