Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef761dacaf6a5018…

MALICIOUS

PDF

47.1 KB Created: 2020-08-19 21:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 85620cac23ca78f34f142f2aa5de6e20 SHA-1: 574c73a320162815fba7b74e3e9b31c3ce7a0501 SHA-256: ef761dacaf6a50187dc2825810f2631a6557753aae6b98092ceb806cdfc35b6a
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. One such link, 'https://ttraff.ru/pify?keyword=lugol%2527+s+iodine+data+sheet', is flagged as malicious. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to lure users to malicious sites under the guise of providing a data sheet.

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=lugol%2527+s+iodine+data+sheet In PDF document text
    • http://files.pebbleaustralia.com/uploads/1/3/2/7/132710787/7576252.pdfIn PDF document text
    • http://vedopu.bernardfraga.com/uploads/1/3/2/6/132681579/kuvusulibitisiw_salurerowox_kupubasevi_noditi.pdfIn PDF document text
    • http://files.louiseneaveportfolio.com/uploads/1/3/1/3/131381542/9159848.pdfIn PDF document text
    • http://jawizifuf.thepts.net/uploads/1/3/1/4/131452977/jevowobo.pdfIn PDF document text
    • http://pijin.brijcommunity.org/uploads/1/3/2/3/132303354/mixawav_lunikufazujakoz_nobikok_segipegaxesol.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/1/0449/3508/6248/files/mazebo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4287/4278/files/somewhere_safe_with_somebody_good.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4480/5525/files/nakuwuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4258/5241/files/mathematics_textbook_for_university.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2269/6098/files/tokisofufedojisizim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0411/6637/files/niwofofejikekufilotu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3556/5978/files/litavekewujafotalive.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1042/4993/files/6054767103.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5855/1189/files/76673156224.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1342/2753/files/4578528077.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2482/6014/files/ribakoxedas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7984/2457/files/gakalekan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4439/7471/files/sewoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2289/9608/files/98659397520.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_off00007ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA9 4964 bytes
SHA-256: d3c9f7606eee379bc00ca1e4e0b3d585d1c5bc74378912ef9c752f3755033883
font_01_sfnt_off00008c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C91 10240 bytes
SHA-256: cce9f823bdc9fafaddf33eefb148dd12d57d35c8509e3f6c2b1ee19fc847aa53