Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dadefbf7c054957…

MALICIOUS

PDF

71.0 KB Created: 2020-08-08 03:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f4ff929cde22c311b23163b120b89ef4 SHA-1: 487dd762cce2e863c4a60540a5b2dde9e7805c28 SHA-256: 4dadefbf7c054957a4766d82c142ed23f5f3f936ebb3badb6f3933808611be95
210 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that leads to a URL associated with known malicious infrastructure. The document also exhibits characteristics of a link farm, with numerous external PDF links, and includes lures suggesting a download button and urgency. The primary malicious URL identified is https://ttraff.ru/pify?keyword=pedagogy+of+biological+science+b.+ed+notes+pdf, which is likely used to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=pedagogy+of+biological+science+b.+ed+notes+pdf In PDF document text
    • http://files.tastefulgatherings.com/uploads/1/3/1/8/131856949/9847458.pdfIn PDF document text
    • http://files.theteethdr.com/uploads/1/3/0/7/130775970/4056856.pdfIn PDF document text
    • http://files.vaughanstx.com/uploads/1/3/1/3/131398479/bufoxe.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/1/0429/7054/6329/files/saxon_math_7_6_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/9403/5880/files/adding_and_subtracting_algebraic_expressions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/9719/0556/files/que_son_las_varices_esofagicas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7888/5280/files/29843440160.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1648/6040/files/scert_kerala_textbooks_for_class_10.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9670/2104/files/ropuzogirete.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4923/8178/files/signs_and_symptoms_of_hepatitis_b.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2313/0009/files/sonufi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7505/2454/files/79084032203.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5096/4904/files/88334520268.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4421/6727/files/sisen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9307/2808/files/dudufaxusi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6340/8795/files/dexolugiwolez.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_off0000c725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC725 5500 bytes
SHA-256: ce80a1bed12b64cbe39e7b64d2378dc082c74ac283f605b73cd56e32451e3fd8
font_01_sfnt_off0000da04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA04 17060 bytes
SHA-256: 0d51a47ba303a9fc1e4c17b73cc08084f4f6a9b16c2ee7b0e3bd247b2368633a