Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21340552b823800…

MALICIOUS

PDF

53.7 KB Created: 2020-08-22 21:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ff67d939ccd3de06821d22b60cdd80d7 SHA-1: a03fd1b8efee96f11acf7ce04c55d84df5602cb8 SHA-256: d21340552b823800b5f483e55944d6cf308250802f6dd289150d32713495932d
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 pointing to Shopify domains, which is indicative of a link farm. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=android+constraintlayout+bias+not+working'. The document body, though heavily obfuscated, contains this same URL, suggesting the primary intent is to redirect the user to malicious infrastructure. No scripts were extracted from this sample.

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=android+constraintlayout+bias+not+working In PDF document text
    • http://files.worldsandgames.org/uploads/1/3/2/8/132816106/lemek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6731/8167/files/68755393828.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0577/0909/files/ornament_background_vector_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7514/1783/files/centrifugation_equipment.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6472/8483/files/advertisement_format_in_english_grammar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9050/2042/files/new_idea_5209_discbine_parts_diagram.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6045/3785/files/agriculture_durable_au_maroc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3533/6605/files/kufajimovokesamobudibebi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3170/8316/files/95185519669.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4852/5208/files/98830454959.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6241/8847/files/portal_gun_terraria.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3278/0695/files/psychosis_creepypasta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7609/1046/files/36658468247.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 2

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_off00007a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A25 5256 bytes
SHA-256: 1ead3b315a958d4d0e2aef01ef60b48b6af70483a5e5912785e60d8c9429aca7
font_01_sfnt_off00008c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C1C 15264 bytes
SHA-256: 53d2b063975b25fcac1a304b9ce5c613cffa6128302e6fca2c7747e5d9ac355f
font_02_sfnt_off0000bbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCB 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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