Malicious PDF — malware analysis report

Static analysis result for SHA-256 637e78cd8f6f7892…

MALICIOUS

PDF

44.6 KB Created: 2020-08-13 06:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: dd3d80d11496652d4e0a970a6f9ca87b SHA-1: 6d010586cf00a5b583116db86faea0eda3734ab1 SHA-256: 637e78cd8f6f7892497fcd447eb4a78b938dfbe8d9caa5f45aa346f4f462ec0e
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to a redirector infrastructure known for malicious activity. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests the PDF is designed to lead users to malicious sites, likely for phishing or malware distribution.

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.cc/wb?keyword=long%20term%20investment%20definition%20pdf In PDF document text
    • http://vilajifun.pjcarradori.com/uploads/1/3/1/1/131164250/tikufironu.pdfIn PDF document text
    • http://files.ragmatical.com/uploads/1/3/0/7/130739919/466853.pdfIn PDF document text
    • http://files.gracefound.net/uploads/1/3/1/4/131438847/d2bf08.pdfIn PDF document text
    • http://files.clearriverredangus.com/uploads/1/3/0/7/130738939/30abab13c0.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/1/0435/0862/9659/files/janome_service_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7810/4728/files/benchmark_advance_4th_grade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7460/0598/files/voith_cardan_shaft_catalogue.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6524/3803/files/lenobapijadunidudi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/fabebebasovi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5301/4423/files/4799302839.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6628/5480/files/34988321941.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1095/7210/files/bradford_city_stadium_fire.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/wishcraft_barbara_sher_deutsch.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2011/4331/files/jezovobibiponetud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2213/9041/files/56150881616.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
🗂 Part of campaign: clearriverredangus.com 3 samples

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_off000070a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70A7 5120 bytes
SHA-256: 0108f1deebd82a0173b32952842a88800c5172d429e351da59f705ee0acd48b4
font_01_sfnt_off00008214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8214 10472 bytes
SHA-256: 3beec48b21a2f92712230e382be43a9f65c5d68790a15feabacf126925361aa9

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