Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a1a4f1f2a09470…

MALICIOUS

PDF

49.1 KB Created: 2020-07-17 19:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: f804400f00b94d50e20c641ed42ed248 SHA-1: 112ad45ce3c002d905ffa0ed7536cd1d69db0372 SHA-256: 65a1a4f1f2a09470033f7c60e5d1ee3e9eb99314dc61c17dab35eabd6cac2d44
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links designed to appear as search results or document downloads, with the primary redirector URL being `https://ttraff.com/wb?keyword=2011%20volkswagen%20cc%20manual%20transmission`. This indicates a phishing or SEO-based redirection scheme. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a malicious campaign.

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.com/wb?keyword=2011%20volkswagen%20cc%20manual%20transmission In PDF document text
    • http://files.zulal.org/uploads/1/3/1/4/131453206/jufot.pdfIn PDF document text
    • http://files.craftyladycrushingcancer.com/uploads/1/3/1/3/131383426/vesosuzuxoje_lonukopivux_jozavakikavid.pdfIn PDF document text
    • http://files.kocanada-usa.com/uploads/1/3/1/4/131437538/zorodoke.pdfIn PDF document text
    • http://files.kohlgallery.org/uploads/1/3/0/9/130969735/5e627852.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/1/0431/5162/2306/files/55009584223.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81274949660.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasodidupafulad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9903/7595/files/32298988243.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3911/3895/files/16272851415.pdfIn PDF document text
    • https://ginawuxeniza.files.wordpress.com/2020/07/difuvizenunuzores.pdfIn PDF document text
    • https://vemupuki.files.wordpress.com/2020/07/67421345179.pdfIn PDF document text
    • https://bubusajofugi.files.wordpress.com/2020/07/30454197050.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0479/5800/files/76386037323.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29318048561.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/xexodozomenebuxojuliviti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5689/0013/files/54819550278.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6385/2712/files/43136229329.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20424522606.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wupukibasabozuxijixosi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6620/4066/files/dubewutezirinu.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_off000081e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81E9 5448 bytes
SHA-256: 82c04c700179600bbac5eae8c89966f3a05780969774084b2c0601315e5e682a
font_01_sfnt_off0000946d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x946D 10052 bytes
SHA-256: fe06d977bf7d041e9fb5461afc43ad3384e1058a216e40e24328e29e9c2db866