Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8f4e99b7cefa87…

MALICIOUS

PDF

42.9 KB Created: 2020-08-13 10:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 9b9dfbbc0feccd512a63718e783aafd6 SHA-1: 1cf8afdfe8bc2b60c0585634d3ba328c72500dca SHA-256: 1a8f4e99b7cefa87be9bf523f9b742255a9a373d2a788e62db47962172ae4dad
194 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of SEO-optimized links pointing to external PDFs, indicating a link farm for traffic manipulation. The primary malicious URL is https://ttraff.com/wb?keyword=servo%20controlled%20voltage%20stabilizer%20pdf, which is designed to redirect users to further malicious content. The document body itself is largely unreadable due to encoding issues, but the presence of the malicious link is sufficient evidence.

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=servo%20controlled%20voltage%20stabilizer%20pdf In PDF document text
    • http://files.lindastcviteachershare.com/uploads/1/3/1/3/131379639/9957935.pdfIn PDF document text
    • http://rupebiw.creativo-school.com/uploads/1/3/1/1/131164538/tewizegif-gazuditamapaj-tazatanilebi.pdfIn PDF document text
    • http://files.siverafont.org/uploads/1/3/2/6/132681229/xoravopufabijorak.pdfIn PDF document text
    • http://sigobofu.terraceminorsoftball.com/uploads/1/3/2/7/132741099/sejafiredar.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/1/0438/2271/0941/files/vakefegutubevesil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/9556/0096/files/flexbar_tennis_elbow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9080/4893/files/nekukobaseputunolo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6960/4001/files/62883013252.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6579/3942/files/complete_bodybuilding_program.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9150/1990/files/78808241231.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4566/5433/files/20001869202.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2484/8795/files/lugavijetu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1905/0908/files/14339356382.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9244/2264/files/wusagoluvit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90685258811.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4923/8171/files/lasirizonaxarix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1043/1896/files/96539335234.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

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68EF 5676 bytes
SHA-256: 4923e5525533aa0ae5695c903fd81d87971d1242b5adab9caf78e801806db9a0
font_01_sfnt_off00007c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C56 10020 bytes
SHA-256: 25913df0222e2d5d808aeb15fbed683355cbdabc7a6931cc00a9fee3a21f3628

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