Malicious PDF — malware analysis report

Static analysis result for SHA-256 21eb2cd3a5313e22…

MALICIOUS

PDF

46.1 KB Created: 2020-08-18 15:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 9ab2ead167169ba3d65aaa0ebefefaab SHA-1: 7af87c3b44e181220f2b8bf3ee0920117def79b2 SHA-256: 21eb2cd3a5313e2296ca9a9e0671f6c06f9fd7475e82712645ba760f5042d80d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/pify?keyword=cooking+academy+4++full+version'. This URL is presented within the document body, disguised as a download for 'cooking academy 4 full version', indicating a social engineering lure. The PDF also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The ML classifier strongly supports the malicious verdict.

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.com/pify?keyword=cooking+academy+4++full+version In PDF document text
    • http://files.whatsthequestion.online/uploads/1/3/1/3/131380397/lurud.pdfIn PDF document text
    • http://lijex.asyouwishuk.com/uploads/1/3/1/8/131856772/2725413.pdfIn PDF document text
    • http://gafexazu.mendinginvisiblewings.com/uploads/1/3/1/6/131637136/9484968.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/1/0429/2945/5271/files/kozatulepi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3714/7811/files/gilit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/9041/7566/files/luxekumizamux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9179/6902/files/13837869900.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6327/1833/files/file_ko_cho_in.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3807/9138/files/35063734864.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9626/7168/files/53882637885.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0145/4496/files/assessment_for_learning_tools.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/81497999224.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8679/1334/files/p_l_and_balance_sheet_format.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 1

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_off00006543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6543 3796 bytes
SHA-256: 4c889a751391da87bec01231fbeb23122dcd56eea558e924282f286dba25cb65
font_01_sfnt_off000072c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72C1 5560 bytes
SHA-256: 9baabfaaa23585bc8453d01963d9a16a8c2eb68930aeb41131dba3e4d6b7d142
font_02_sfnt_off000085ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85AD 11328 bytes
SHA-256: ec9906b7878cdaab63a31619e483fb2f87ae96b6442d0cf7caf6d86867ed6f8d

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