Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7fcbf801139c063…

MALICIOUS

PDF

71.2 KB Created: 2020-07-10 03:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 7cdddfe6990b2476f5e1cd33f3803129 SHA-1: 010a42d4b2d38d217f1f9248536a102f1993925b SHA-256: f7fcbf801139c06312feed6fc8aa6a0fbbf468eb09c99fd311bf5a624ae102df
194 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, including a critical redirector link to 'ttraff.com' and numerous links to external PDF files hosted on various domains. This indicates a link farm or SEO poisoning tactic, likely designed to direct users to malicious sites. The document body itself is largely unreadable, but the presence of the malicious links is sufficient evidence for this assessment.

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=production%20and%20productivity%20pdf In PDF document text
    • http://files.martinezsoccer.com/uploads/1/3/1/6/131606854/8ee4ac5.pdfIn PDF document text
    • http://files.unidadepastoral.com/uploads/1/3/1/4/131437351/195585ef.pdfIn PDF document text
    • http://files.brentfamilyfarm.com/uploads/1/3/1/3/131379781/5398689.pdfIn PDF document text
    • http://files.newellbooks.com/uploads/1/3/0/8/130813797/vapujulo_rajeker_vewidufe.pdfIn PDF document text
    • http://files.rbhsmediacenter.org/uploads/1/3/0/8/130813307/risasenurumuvaf_zatobuwewor.pdfIn PDF document text
    • http://files.re-ventum.com/uploads/1/3/1/1/131163538/868859.pdfIn PDF document text
    • http://files.musicatmainstreet.com/uploads/1/3/0/7/130739839/davetuxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://pagasel.files.wordpress.com/2020/06/26144809078.pdfIn PDF document text
    • https://vodupabaneze.files.wordpress.com/2020/06/5319724551.pdfIn PDF document text
    • https://vasotox.files.wordpress.com/2020/06/wisivib.pdfIn PDF document text
    • https://bazazexa.files.wordpress.com/2020/07/45547269104.pdfIn PDF document text
    • https://jejiwivu.files.wordpress.com/2020/06/62496049249.pdfIn PDF document text
    • https://nerebev.files.wordpress.com/2020/07/45492173202.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12457093378.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/34530012154.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepikopu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40313354442.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23281911610.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sigejorivuzogekos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26443777516.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_off0000d9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C1 4868 bytes
SHA-256: af713181ce9f03bf0023b9d1ef80664c97087af5fe6490fa2ad0aa644fc5e7aa
font_01_sfnt_off0000ea63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 11152 bytes
SHA-256: 876e6a026a9b98d52c8ea539d516a4d427e445202f32b0a91c082688bba71267