Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4bc80ae4c1850eb…

MALICIOUS

PDF

40.7 KB Created: 2020-08-21 00:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: e9ee0644b455ba0a2cdad13f6978ce32 SHA-1: a37e2409817a406bd450ecba8f2c352fa68a6d5f SHA-256: d4bc80ae4c1850eb10e889b4a6f41ce9ec371446e25bc8344ea4e0ebf31dd814
202 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, including one pointing to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, also contains this URL and appears to be a lure for educational materials. The presence of a 'download button' heuristic further supports the social engineering aspect of this attack. The file is likely designed to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • 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=free+printable+division+worksheets+grade+3 In PDF document text
    • http://barura.victoriayoga.co.uk/uploads/1/3/1/8/131871390/3674860.pdfIn PDF document text
    • http://files.mrsararadian.com/uploads/1/3/1/4/131453676/725d0ad5d8b20d.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/1/0431/7963/8942/files/62354850749.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/7058/0902/files/34064226387.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7620/6238/files/47959759865.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6563/8048/files/65065426342.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/high_school_english_grammar_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/nitesuxijunajafin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3080/4642/files/fetogugobezul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2297/4117/files/tamuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5382/5704/files/4969124580.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4970/5881/files/toripejemivaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4024/2840/files/tupatani.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_off00005b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B97 5696 bytes
SHA-256: 5bc09fa37e47af0c9980191ed80d61f0fa856095085cecd15d54bd5a17bd7a27
font_01_sfnt_off00006efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EFB 11604 bytes
SHA-256: 2a1f57a783b43c9b97eb3f9d69a05af913b635ed40a4dc441f19b4610a614fa5

Open this report in the interactive analyzer, or submit your own file for analysis.