Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5382f3f5fb31a3f…

MALICIOUS

PDF

39.0 KB Created: 2020-07-21 02:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: fab8e47bce3bd899017f418924626c7b SHA-1: e3ca8311c65c5bc6e9424b07d9abf60e6051dc0a SHA-256: d5382f3f5fb31a3f20323ecf61f7483639d12b00743227ba7c4c98fbb8cde773
202 Risk Score

Malware Insights

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

The PDF file contains a malicious redirector link pointing to 'ttraff.ru', which is designed to lead users to a farm of SEO-optimized PDF files hosted on Shopify. The presence of a visual download button further supports the lure. The document body itself is heavily obfuscated and appears to be mostly binary data, making it difficult to extract meaningful content beyond the embedded links and metadata.

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/wb?keyword=pretest%20emergency%20medicine%20pdf%20free%20download In PDF document text
    • http://files.5lanterns.com/uploads/1/3/2/6/132681690/vuzoribadika.pdfIn PDF document text
    • http://files.rachelmambach.com/uploads/1/3/0/7/130775220/togurufasaziren.pdfIn PDF document text
    • http://files.kevinanthonyhull.com/uploads/1/3/0/8/130874266/9024802.pdfIn PDF document text
    • http://files.activeambassadors.org/uploads/1/3/1/1/131163841/14168.pdfIn PDF document text
    • http://files.drjessica.ca/uploads/1/3/2/7/132740234/9228330.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/1/0433/0687/7080/files/78549170372.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4923/8184/files/karozixego.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0091/3310/files/85350582825.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1723/8685/files/vedetavevobavad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0477/1999/files/19561047151.pdfIn PDF document text
    • https://ripebolidar.files.wordpress.com/2020/06/24696863165.pdfIn PDF document text
    • https://migoxuwo.files.wordpress.com/2020/06/gepem.pdfIn PDF document text
    • https://waxizonuv.files.wordpress.com/2020/06/65558255291.pdfIn PDF document text
    • https://kutunasu.files.wordpress.com/2020/06/tisodetozor.pdfIn PDF document text
    • https://zigonasoxovu.files.wordpress.com/2020/06/80981112159.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4538/8442/files/rozubi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0659/0106/files/xulazepewixurivovekop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8013/8398/files/gavitesim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files/sidaxumuxajuwax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mikawewetekiwu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/minirefotapobizezuloxot.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_off00005afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AFB 5460 bytes
SHA-256: d7e209ba5b50f4797155b8c6c52888f8f7912b089b9bc88abaf79bdc97c90b2f
font_01_sfnt_off00006d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D81 9608 bytes
SHA-256: d1a237b9c83dc96dd7d31a4e355a4d4d2e983a8fdff854327056ecc30c8bb01c