Malicious PDF — malware analysis report

Static analysis result for SHA-256 184968dec28df0b3…

MALICIOUS

PDF

42.9 KB Created: 2020-08-13 06:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b642018b71d298521d3e4f644f4baac9 SHA-1: d76e332668ecb6ff502df8ec0366e51a641ffcf0 SHA-256: 184968dec28df0b35323f9e09f971eb40f5f1980a0901fb76ac933b19840dec9
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded links that redirect to malicious infrastructure, specifically a link farm designed for SEO manipulation. The primary lure appears to be 'Chegg solutions free pdf', directing users to a redirector that likely leads to further malicious content or phishing pages. The ML classifier strongly indicated maliciousness, supporting the heuristic findings of a malicious redirector and link farm.

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/pify?keyword=chegg+solutions+free+pdf In PDF document text
    • http://fixoxabog.holisticwellnessny.com/uploads/1/3/0/8/130874633/7868057.pdfIn PDF document text
    • http://files.broadwaysilkens.com/uploads/1/3/0/7/130775002/4432974.pdfIn PDF document text
    • http://sudizewa.stephlovesfitness.com/uploads/1/3/1/6/131606346/3160142.pdfIn PDF document text
    • http://files.god4ce.com/uploads/1/3/1/6/131637419/08aef60b8acee.pdfIn PDF document text
    • http://duwoxuri.myyearofhugs.com/uploads/1/3/1/1/131164406/tixapakex.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/1/0439/9464/4638/files/autodesk_sketchbook_android_tutorial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6805/4949/files/sweet_apple_acres.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/forever_young_jay_z_lyrics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9000/9502/files/academic_writing_course_outline.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8713/4882/files/27693947906.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0103/6443/files/wubegudadarojuwopa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7426/4996/files/94402189445.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6212/2903/files/84816499669.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0716/5095/files/advanced_wastewater_treatment_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6778/4864/files/tatodewobefo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6153/3089/files/kunenejutabekotibi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1206/3391/files/nerusuworigilipavidelo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0156/0737/files/84260631858.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 7

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_off00006c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C2E 4996 bytes
SHA-256: f1228e3dc1a1732e3197f1d4772ff9955da8e2f8f259ce0e4b6cc76939e8b052
font_01_sfnt_off00007d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D27 9976 bytes
SHA-256: 30b2c0ff923fddf417c664508b25fa4cf7dd32c484e147924b80e6adba2f9e60

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