Malicious PDF — malware analysis report

Static analysis result for SHA-256 5847b3e39ab0f34b…

MALICIOUS

PDF

43.6 KB Created: 2020-10-30 20:38:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: adc15aa7adf32c1dd14cd13ffdd8f73a SHA-1: 8c6b740ea67e385c98e6c01da61dd06c3894088b SHA-256: 5847b3e39ab0f34bcf7483f6fb7c690e38c3cc1140a817c43e280a77e61d9958
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple links to a redirector URL, identified as a malicious link farm and a lure for free downloads. The ML classifier strongly indicates maliciousness. The embedded URLs are designed to lead users to potentially harmful content, likely a phishing or malware distribution site.

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/123?keyword=utility+billing+audit+program In PDF document text
    • https://cdn-cms.f-static.net/uploads/4390642/normal_5f8e323933cd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369519/normal_5f95749de1b37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411917/normal_5f9adace90867.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370303/normal_5f8d2eaff17ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409236/normal_5f9386fc250d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375889/normal_5f99b48e82c95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405413/normal_5f9865e63f4f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392867/normal_5f935c17b8a31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379839/normal_5f96e8613e0cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387715/normal_5f8d41770a21a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379384/normal_5f8b67320228d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371786/normal_5f8e198072791.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/1/0479/5973/6476/files/vedafivuvipadibawa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e43f1c40-0ea7-44d4-8c55-22b9845f4370/used_tractor_mounted_post_driver_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0de3af24-d792-4845-9b62-525dcb97d403/padibopageperararavo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35b5c02f-4928-49d5-b06d-07b36aa50a63/linear_equations_and_inequalities_wo.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_off00006b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3A 5332 bytes
SHA-256: fa0fdabf9500bd172603883ab242d0fb8b1fee8153908ec7f1b2f1b9450a2dfc
font_01_sfnt_off00007d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D4F 10484 bytes
SHA-256: 9b239f6a0bf2b73d9d10f9a3a08a5789c489598ee302aba7c0e7f637d8a45224

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