Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a49419935fcc5a…

MALICIOUS

PDF

40.8 KB Created: 2020-10-03 12:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: ad8ec51b40b061bd7aa39f75796dab25 SHA-1: a0a9b63bace3097159ca11954b0f09de6c46a1e0 SHA-256: a4a49419935fcc5aa42ad0ff6cfc5c5cde2e3c7f47e77c1fbb87fc252af50402
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=dr+sebi+book In PDF document text
    • http://rupoda.drexelteachers.com/uploads/1/3/0/7/130739173/zosunovulo.pdfIn PDF document text
    • http://files.anniesteinert.com/uploads/1/3/1/8/131872032/litixo.pdfIn PDF document text
    • http://files.fitflexyfolk.com/uploads/1/3/2/6/132681362/aae5d8f53242.pdfIn PDF document text
    • http://files.feliciancaring.com/uploads/1/3/1/4/131437491/3792743.pdfIn PDF document text
    • http://files.mdmcentertainment.com/uploads/1/3/0/7/130776399/jelapotasuzerekuvuj.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/1/0432/5038/5051/files/fomuwe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7142/9015/files/57773309521.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0773/7496/files/feduwijugutobinaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7875/3697/files/kogogabolavejimi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9866/7163/files/mid90s_2018_google_drive.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2006/1342/files/st_joseph_academy_fontana.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/1500/7126/files/93619357683.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_off00006298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6298 4640 bytes
SHA-256: f17a7e807e0be752995322df80176f6de7f449e42d407083fbd69ce124d37db4
font_01_sfnt_off0000727a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x727A 10784 bytes
SHA-256: 15b67eabc105cf6b7599fb65380744850f984ff67d50b847861e98bbb93f1006