Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b54a6c2c1de333…

MALICIOUS

PDF

41.3 KB Created: 2020-08-08 18:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 382c84e0e561ee4b97489153523ec0e6 SHA-1: c712962b071904a5b206911966deee24dbe33c8f SHA-256: a7b54a6c2c1de3334910d7f07689ec7784d7c3b18df1805b0a41ecaeaaf2267f
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical redirector link to ttraff.cc. The document body, though obfuscated, contains text related to practice tests and includes the malicious URL. This indicates the PDF is designed to redirect users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted from this sample.

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.cc/wb?keyword=practice%20test%20b2%20cambridge%20pdf
    • http://files.mascoutahsteakhouse.com/uploads/1/3/1/4/131409761/gudugelumorisisus.pdf
    • http://files.freedomdayusa.com/uploads/1/3/0/7/130776629/6241389.pdf
    • http://files.carolgrice-curran.com/uploads/1/3/1/4/131452949/888ad9e5.pdf
    • http://zixifabuv.gotchacostumes.com/uploads/1/3/0/7/130740013/lozofozap.pdf
    • https://cdn.shopify.com/s/files/1/0438/2919/9005/files/66943035428.pdf
    • https://cdn.shopify.com/s/files/1/0434/0655/7345/files/oxford_dictionary_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/5285/9543/files/xoliz.pdf
    • https://cdn.shopify.com/s/files/1/0433/1618/3205/files/bodybuilding_anatomy.pdf
    • https://cdn.shopify.com/s/files/1/0432/9088/6312/files/gofuveju.pdf
    • https://cdn.shopify.com/s/files/1/0440/5621/5702/files/causas_de_urticaria_cronica.pdf
    • https://cdn.shopify.com/s/files/1/0433/5910/9279/files/33129010261.pdf
    • https://cdn.shopify.com/s/files/1/0435/7813/0593/files/pikiwiliregikufe.pdf
    • https://cdn.shopify.com/s/files/1/0427/9504/0924/files/12712475055.pdf
    • https://cdn.shopify.com/s/files/1/0439/2543/8619/files/weight_training_for_cyclists.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/nawonevatonufabomugikesi.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8839/files/lemij.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1101/files/jolonegidinipisisebo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9168/8610/files/55362996327.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060f2.bin
9c4cc698a53152ee17579b8c93356b02e026260588dd58591c920cf1ac965047		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60F2 5716 bytes
font_01_sfnt_off00007451.bin
3f6561a1fd8e4ac53b095186eedf4f75eaefdd9b7a4db6ebcbb3781b9ab70fbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7451 10608 bytes

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