Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe21580fe1a2ca90…

MALICIOUS

PDF

34.4 KB Created: 2020-08-28 14:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 211ac83d53f2f25f29e03b77d9f55a84 SHA-1: beb39acbcc147b2c43c80a1e6d9da08b9368d92d SHA-256: fe21580fe1a2ca902565671ddccb63277da88fa8c384f835f0b8e846125baa0a
194 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to its inclusion of a link farm containing numerous external PDF links. One of these links, 'https://ttraff.ru/pify?keyword=young+chop+out+my+system+mp3', points to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and embedded URLs, suggesting an attempt to lure users to malicious sites.

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=young+chop+out+my+system+mp3 In PDF document text
    • http://files.ktharrington.com/uploads/1/3/2/6/132682232/702cadf8b1.pdfIn PDF document text
    • http://latewozuj.genreccatalogs.com/uploads/1/3/1/4/131407406/zukepifopewup-putaporozefufam-genomuwumit-vijelonin.pdfIn PDF document text
    • http://gafigo.exploringvoice.com/uploads/1/3/2/6/132681260/revopekovimomofu.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/1/0440/2829/7381/files/kizikurum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1687/1333/files/the_impossible_quiz_level_56_answer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3323/9457/files/rapevomepebotorelatov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2426/8968/files/formato_certificado_medico_cruz_roja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0181/2904/files/beethoven_biography.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4302/7106/files/academic_reading_ielts_test.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7847/5162/files/2008_honda_accord_maintenance_schedule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0817/0918/files/88319043842.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7628/0729/files/rububud.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4824 5236 bytes
SHA-256: ae525c80274aaad206e79e8f6313feb71690a069e7f1394769acdd85b0ff96eb
font_01_sfnt_off000059e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59E3 10324 bytes
SHA-256: 61ac1de49e1b6ae2c78960dd22082b633727a068610fe0dd32cc7c5f4202faeb