Malicious PDF — malware analysis report

Static analysis result for SHA-256 08a84f0968c21ba4…

MALICIOUS

PDF

43.2 KB Created: 2020-08-12 12:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 95bbf1c402b3f3288bc2cd04fc3403b6 SHA-1: 96c69056da8ef2aebe3e00ddd518e45ac0dbecb2 SHA-256: 08a84f0968c21ba4592a092e79525f353e383bb8a1cf16827103085f2fae0e4b
194 Risk Score

Malware Insights

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

The PDF contains multiple links to SEO redirectors, including one that masquerades as free educational material. The primary malicious link, https://ttraff.com/wb?keyword=free%20noun%20worksheets%20for%205th%20grade, is designed to lead users to potentially harmful content. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a link farm or phishing attempt.

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=free%20noun%20worksheets%20for%205th%20grade In PDF document text
    • http://files.cruzla.net/uploads/1/3/1/4/131453106/zufesig-rojerirated-dujikixuvoke-difimaf.pdfIn PDF document text
    • http://files.exploringteacher.com/uploads/1/3/0/8/130873708/1284844.pdfIn PDF document text
    • http://files.universitystemacademy.com/uploads/1/3/1/1/131164130/xireneboruzudar.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/1/0434/7399/3890/files/81442869221.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8083/5482/files/local_anesthesia_malamed_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3747/2421/files/10285443878.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupenase.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/3235/8560/files/assembler_des_en_un_seul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5040/1945/files/97035722380.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7877/9029/files/26386059339.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5872/5018/files/24226663147.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2494/0184/files/slow_dancing_in_a_burning_room_guitar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4229/2390/files/28326805123.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4922/1281/files/xetured.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7188/9815/files/7070938844.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_off000069cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69CC 5372 bytes
SHA-256: 75264c30e2197211f9dd5ff462817b14f1c7d61807e3180d2bdf82aa09aa7bd6
font_01_sfnt_off00007c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C29 10548 bytes
SHA-256: cf7cda365646edf700b0b28b536512a19356a8603e5d47949c5b71c09fe43ed1

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