Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c3066c1a637147…

MALICIOUS

PDF

46.1 KB Created: 2020-07-26 01:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b0f8cc7ea94e3d05241fd536c9c0a4d5 SHA-1: 96d4155910c1a43f3e648b2aa56ddc8df650199d SHA-256: a3c3066c1a637147928fead666c59c9607a43ebbf0e42f6482ae140569062da6
194 Risk Score

Malware Insights

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

This PDF file is identified as malicious due to its use of a link farm, which contains numerous embedded URLs. One of these URLs, 'https://ttraff.ru/pify?keyword=grammar+worksheets+pdf+free', is flagged as a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'grammar worksheets pdf free', indicating a social engineering tactic to drive users to malicious infrastructure.

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.ru/pify?keyword=grammar+worksheets+pdf+free In PDF document text
    • http://files.issimomusic.net/uploads/1/3/1/4/131407138/6030158.pdfIn PDF document text
    • http://files.veilofyork.co.uk/uploads/1/3/0/7/130775666/2500108.pdfIn PDF document text
    • http://files.thecreativitycore.com/uploads/1/3/0/7/130739144/6871841.pdfIn PDF document text
    • http://files.holytemplec.org/uploads/1/3/1/4/131453598/zaxopoxudito_mogogodabuga.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/1/0433/0687/7080/files/nedodakamilutejevojive.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31903895201.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8777/4374/files/11975169183.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71061356311.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nebedaxogatasimilore.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3749/1354/files/48225701137.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6304/0408/files/37770278187.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4607/5542/files/dujokegutasu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nunirisolifugonogebivaxez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0193/6033/files/fadirisavo.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 6

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_off00006f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F8F 5072 bytes
SHA-256: b1c3526cf090172d4ccc94aa724e55f07eeeb95288dce68c3a8b9ca29cc95ffe
font_01_sfnt_off000080e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80E5 13796 bytes
SHA-256: 3f898564c1844f5f35b446ebdb84ad0f7cb267b0541280257077d5f883ee0f13

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