Malicious PDF — malware analysis report

Static analysis result for SHA-256 150c8526e8733139…

MALICIOUS

PDF

36.6 KB Created: 2020-08-10 01:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: e629da4ba2582c7c8efca12dddf1dce0 SHA-1: 7ec68d659bc3ba0e3b628eb1f262b680a12f3532 SHA-256: 150c8526e8733139488426f0b2b17799acba2fd893a3f0fa1205d461b29ec355
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK. The primary redirector URL is https://ttraff.ru/pify?keyword=academy+stars+6+workbook+pdf, which is used to lure victims under the guise of a free workbook download. The ML classifier also strongly indicated maliciousness.

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=academy+stars+6+workbook+pdf In PDF document text
    • http://files.trentriverdesigns.com/uploads/1/3/1/6/131636692/8220645.pdfIn PDF document text
    • http://dutaxat.victoriouslynicole.com/uploads/1/3/1/4/131408738/662179.pdfIn PDF document text
    • http://files.thepowerhouseuk.com/uploads/1/3/2/6/132695862/5660009.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3519/7602/files/jusawodibofaguzixazemov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3414/0056/files/du_sort_by_size.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2391/7478/files/70726637544.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0807/1576/files/komoximuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/barron_s_gre_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4245/5207/files/sweet_jane_lyrics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9649/6544/files/71254095049.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6529/5526/files/warusomodafofikelalezotem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/50_ways_to_leave_your_lover_chords.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2970/6390/files/20360961014.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 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000436b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x436B 5444 bytes
SHA-256: 540beecec68c7a76a6015b22bb361f804fa06703e85efd3b9c95788276cf73d5
font_01_sfnt_off00005601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5601 9972 bytes
SHA-256: 5c152f21cd13fab7ec6a0631ca0322110d4d127b5a1c636dcb9c8d60f280d417
font_02_sfnt_off00007797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7797 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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