Malicious PDF — malware analysis report

Static analysis result for SHA-256 1951f7b7cc8e8433…

MALICIOUS

PDF

44.5 KB Created: 2020-10-27 22:55:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5a049b17c2c21de49774dafc1187fa13 SHA-1: eaa6ee9ff3946953e3fcb73d3a9992c7818347c1 SHA-256: 1951f7b7cc8e8433a2642a104b127a27e7e7f5a92772e5b81a3f25d732815d20
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains multiple links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that points to a redirector. The presence of a link farm heuristic further suggests malicious intent, likely to drive traffic to malicious sites or for SEO manipulation. No scripts were extracted, but the embedded links are the primary indicators of compromise.

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/123?keyword=tony+stark+sunglasses+iron+man+2 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4386839/normal_5f8e277974fdf.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/3808383.pdfIn PDF document text
    • https://seboneluwisog.weebly.com/uploads/1/3/4/3/134368334/39b76408ce.pdfIn PDF document text
    • https://xusawoji.weebly.com/uploads/1/3/0/7/130739635/wavek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/occupational_hazards_for_nurses.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/wojutatafowevuze.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/capek_rur.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/59780236626.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5552/1695/files/nugesepa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7029/8523/files/966616796.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/hindi_typing_practice_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/91460601293.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/23764814567.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/65349413880.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/6640/0154/files/bemewemefaxosasum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1485/6610/files/work_and_power_calculations_answers.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 8

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_off00006d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D55 5252 bytes
SHA-256: 29f10f9ed142aec10eb9e40372cd1080086c79ce3861122f879ddead68c82ff8
font_01_sfnt_off00007f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F2B 11172 bytes
SHA-256: 96cecebbc6f6e56bb41ca3dd6db57b0697e3ee381146f1421e1265fe6336d59f

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