Malicious PDF — malware analysis report

Static analysis result for SHA-256 157ca982b0bdc53d…

MALICIOUS

PDF

42.3 KB Created: 2020-07-28 16:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d74ae1744608997296aa291a5556401f SHA-1: 07e92892fee85b6d5dbd84718a18f2e26a49a362 SHA-256: 157ca982b0bdc53dea84b40282a38b0fae807bd9e9ff463e8a71e9a9c78e193a
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with a critical heuristic firing for linking to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=chasing+coral+video+worksheet'. The document body, though heavily obfuscated, suggests a lure related to a 'worksheet'. The presence of numerous external PDF links, many hosted on Shopify, indicates a potential link farm or distribution network. No scripts were extracted, but the primary attack vector appears to be directing users to malicious URLs.

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=chasing+coral+video+worksheet In PDF document text
    • http://files.lakeothehills.com/uploads/1/3/1/4/131452824/dobavoraso-lasawakat.pdfIn PDF document text
    • http://files.danielgroupministry.com/uploads/1/3/1/0/131069887/lunezufe.pdfIn PDF document text
    • http://files.mrsberens5thgradenews.com/uploads/1/3/1/3/131380308/rumixaw-kibagedudobeloj-dekebulamu.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/1/0431/4136/5922/files/mekefinofiza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0898/9096/files/34842731451.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kewosa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8502/7745/files/mipitugezuzurojirop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9798/1082/files/sojipagovo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8404/5719/files/sazevuluposaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8875/6374/files/narubebasozasovububev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3830/8512/files/75194593439.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9114/8444/files/ripomexifudubironep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8385/8080/files/xajot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4391/2854/files/48907887099.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9484/3298/files/89175454771.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/nodokinekimu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68B8 5228 bytes
SHA-256: b5d830293cb70ca4882625bb104a6d640c2dfac0f91529798b94a7ed9a675df3
font_01_sfnt_off00007a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A86 9880 bytes
SHA-256: 56b36e508cfdce1da3f53de3fe10b4eb1e9fba6aac43be37f32cbb6c31ba1bff

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