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)
MD5: d74ae1744608997296aa291a5556401f SHA-1: 07e92892fee85b6d5dbd84718a18f2e26a49a362 SHA-256: 157ca982b0bdc53dea84b40282a38b0fae807bd9e9ff463e8a71e9a9c78e193a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, which is indicative of a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were extracted, the presence of numerous external links suggests an attempt to redirect the user to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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
    • http://files.lakeothehills.com/uploads/1/3/1/4/131452824/dobavoraso-lasawakat.pdf
    • http://files.danielgroupministry.com/uploads/1/3/1/0/131069887/lunezufe.pdf
    • http://files.mrsberens5thgradenews.com/uploads/1/3/1/3/131380308/rumixaw-kibagedudobeloj-dekebulamu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4136/5922/files/mekefinofiza.pdf
    • https://cdn.shopify.com/s/files/1/0439/0898/9096/files/34842731451.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kewosa.pdf
    • https://cdn.shopify.com/s/files/1/0437/8502/7745/files/mipitugezuzurojirop.pdf
    • https://cdn.shopify.com/s/files/1/0430/9798/1082/files/sojipagovo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8404/5719/files/sazevuluposaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/8875/6374/files/narubebasozasovububev.pdf
    • https://cdn.shopify.com/s/files/1/0438/3830/8512/files/75194593439.pdf
    • https://cdn.shopify.com/s/files/1/0432/9114/8444/files/ripomexifudubironep.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8080/files/xajot.pdf
    • https://cdn.shopify.com/s/files/1/0434/4391/2854/files/48907887099.pdf
    • https://cdn.shopify.com/s/files/1/0431/9484/3298/files/89175454771.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/nodokinekimu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

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

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