Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3aeb5ea50f3b968…

MALICIOUS

PDF

44.9 KB Created: 2020-07-13 23:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 05e9b4913dd27171ccbb7e0a059ab3f5 SHA-1: bc81fa77a3c0a6b817319401b6ec4cf482badc1b SHA-256: b3aeb5ea50f3b968d951774e49e26dfcada3ee0e67cedf23d328e38db55914a9
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to redirector infrastructure. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely used to funnel victims to further malicious content. The document body appears to be obfuscated or corrupted, but the presence of the URL and the heuristic firings strongly suggest a phishing or redirection attack.

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://ttraff.cc/wb?keyword=il%20pianista%20sull In PDF document text
    • http://files.bigdsfireworks.com/uploads/1/3/1/3/131379059/kirotexemozozigifad.pdfIn PDF document text
    • http://files.chicagoschoolofgrappling.com/uploads/1/3/1/4/131409170/312064.pdfIn PDF document text
    • http://files.3dudesphotobooth.us/uploads/1/3/1/4/131452741/b805a5189.pdfIn PDF document text
    • http://files.usemillennium.com/uploads/1/3/2/6/132696117/b02fbaca053c8.pdfIn PDF document text
    • http://files.hethwoodfoundation.com/uploads/1/3/2/6/132682785/ad81cdbdc40.pdfIn PDF document text
    • https://ttraff.cc/wb?keyword=il%20pianista%20sull'oceano%20spartito%20pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://guduwuzutexo.files.wordpress.com/2020/07/7538837024.pdfIn PDF document text
    • https://jekaxiwu.files.wordpress.com/2020/06/vebufaxoladajowef.pdfIn PDF document text
    • https://xomuxemilud.files.wordpress.com/2020/06/48731069091.pdfIn PDF document text
    • https://remopar.files.wordpress.com/2020/06/20155773207.pdfIn PDF document text
    • https://zaneraji.files.wordpress.com/2020/07/pemij.pdfIn PDF document text
    • https://wamavaf.files.wordpress.com/2020/07/fifejapokowipib.pdfIn PDF document text
    • https://jabetukefil.files.wordpress.com/2020/07/jopuporugoxixoralirazejik.pdfIn PDF document text
    • https://zafugetizif.files.wordpress.com/2020/07/92162013820.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6464/7077/files/ligepogekotaniwetul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/notadenagefajofakiwu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8866/7039/files/vavipikulofanaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kufanagapaxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7955/6504/files/30790408717.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72890356131.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40323832667.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_off000073bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73BC 5004 bytes
SHA-256: 864ce24a113c6a8cbf311b520bf3f66018c91b87a9ecfe4983a12a852792a643
font_01_sfnt_off000084bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84BC 9688 bytes
SHA-256: 0076c98451704ef7e1c92011acf07df80b8edc9b58eb1ec8328f4a440d8eeb33