Malicious PDF — malware analysis report

Static analysis result for SHA-256 c671b94c1939a0c6…

MALICIOUS

PDF

43.6 KB Created: 2020-09-30 14:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: ebbf08f1e5e110736e26fac4500a2ce9 SHA-1: bca8d1abcc1ad1a914100a711766530c25b51d50 SHA-256: c671b94c1939a0c69bf0aec79c34a37f0ead4d14241cfe017a5f0570d8241e01
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=basic+calculus+grade+11+textbook+pdf In PDF document text
    • http://kevaguvop.lilcameronwrites.com/uploads/1/3/0/9/130970004/galapa.pdfIn PDF document text
    • http://rufef.derrettphoto.com/uploads/1/3/2/3/132303382/fawofamamoj.pdfIn PDF document text
    • http://files.photoforartists.com/uploads/1/3/0/7/130776509/5035485.pdfIn PDF document text
    • http://vinolegex.fairylight.store/uploads/1/3/0/7/130739430/dosamimitow.pdfIn PDF document text
    • http://files.whistlingfrogresort.com/uploads/1/3/2/6/132681002/masaberilanimubaloji.pdfIn PDF document text
    • http://webal.michaelayates.com/uploads/1/3/1/3/131379554/9384932.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/bb959cf5-f0e5-465b-870a-9d65f098b94c/pexufelonemoxuxeditimixan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3340085-d596-41fe-85ce-18900e3841e8/10751165266.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d4ebf80-4e44-41ef-9b68-f4fb457cc5bd/24681682712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf88e19-d677-4a16-ad00-42587d91d2ca/logowukigugugulasedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc677152-35dc-4ea5-9bc6-313af0addc81/60553870445.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E1D 5472 bytes
SHA-256: 07cdc120e0b3a204ccd597f1c75a2311d21cd7307afc7725467bd1938475cdbd
font_01_sfnt_off000070cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70CF 10260 bytes
SHA-256: b58a4d366105e2ef78dd6a3d2cbf58ef49297646b4168374dfcbeadc1339ed63
font_02_sfnt_off000093ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93EE 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361