Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a230e940962e72…

MALICIOUS

PDF

35.5 KB Created: 2020-10-06 17:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 46aafb06f3f3f8c415160791888dc10b SHA-1: aa6bbc3d859738d34a1f335d6c52fc7da9103ebb SHA-256: a7a230e940962e72f8f75390269f2e862f89865274d09780396d983d5fb217f9
234 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=j2ee+complete+reference+pdf In PDF document text
    • http://lodopes.gardenclubofthemiddlepeninsula.com/uploads/1/3/2/7/132740978/d590cf9d31a83.pdfIn PDF document text
    • http://rugar.embracedlingerie.com/uploads/1/3/1/8/131856907/dabokoxikadawog_xajetomakane.pdfIn PDF document text
    • http://sudume.e-learningo6u.com/uploads/1/3/1/4/131453301/9563008.pdfIn PDF document text
    • http://files.chidonhatanakh.com/uploads/1/3/0/8/130874493/samijeten.pdfIn PDF document text
    • http://files.pibpoa.com/uploads/1/3/0/8/130874413/93e78.pdfIn PDF document text
    • http://files.chicagotrainingcenter.org/uploads/1/3/0/7/130776363/nejibaxuzod.pdfIn PDF document text
    • http://files.ravenaterra.com/uploads/1/3/0/7/130776611/1181603.pdfIn PDF document text
    • http://files.jessicastockton.com/uploads/1/3/0/7/130775679/b8280520a5c4f.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/1/0462/3820/4053/files/wopeva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/7817/5908/files/tokitovadi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8876/7901/files/gexukijita.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1643/8438/files/robin_banks_mind_power_book.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_off00004ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4ED6 5036 bytes
SHA-256: bef0bef1db1d21f812c3abd323a6f9d187627ac43d4fb88fc866e4dadae8c1e2
font_01_sfnt_off00005fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEA 9832 bytes
SHA-256: 9089fb44232b33b146b92366c97287f82800c9696df6df47fcef7c7220a681c0