Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e38d0c3b6cbb8d…

MALICIOUS

PDF

49.9 KB Created: 2020-08-23 04:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 43a000bb107b61b3ea9d709421256701 SHA-1: 245c63abf28ac3f2d4d6d8882583b6bc52f415f3 SHA-256: f3e38d0c3b6cbb8df31f19a459d58ef80142b1bb8db92fa16fb4a3e5dd81ee37
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF file contains numerous embedded links, with a critical heuristic firing indicating it's a malicious redirector. The document body, though heavily obfuscated, contains text related to TOEFL preparation and a URL that redirects to a malicious domain. This suggests a phishing or scam attempt to lure 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.com/pify?keyword=toefl+ibt+integrated+writing+topics+with+answers In PDF document text
    • http://files.premierpropertysvc.com/uploads/1/3/1/6/131636954/webapak.pdfIn PDF document text
    • http://files.akashachamberlain.com/uploads/1/3/1/4/131437885/tunupesa.pdfIn PDF document text
    • http://sujov.bestsoundonly.com/uploads/1/3/0/7/130775934/figebebafilobereraxu.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/1/0430/8788/8551/files/chatwal_book_of_inorganic_chemistry.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6499/7526/files/21075507065.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/2812/3545/files/caller_id_app_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1015/4908/files/77951463943.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2132/0870/files/chromecast_extension_chrome_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1967/2472/files/84217414578.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1227/5870/files/11428469570.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2351/5294/files/sample_answers_to_interview_questions_for_nurses.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0203/5351/files/37224685041.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_off0000849b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x849B 5600 bytes
SHA-256: b0dfa88ef8abdcfd22e28487f820a19761150e4d27ffbb817ddee5471162ad18
font_01_sfnt_off000097a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97A9 10236 bytes
SHA-256: de8f954b8c9f8e535c5e03a5680ab856aa22255472f6095eba86f5c61b994741

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