Malicious PDF — malware analysis report

Static analysis result for SHA-256 d79d4f81f3758f7f…

MALICIOUS

PDF

41.8 KB Created: 2020-08-24 04:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fdcdcbb0edcaaac3c89e9ecdef7406b SHA-1: 24d746ea0cfc8d61f06e6ba369f591f82dab6ddc SHA-256: d79d4f81f3758f7f402e36637ad4e135d9b9d9995bda5eb83f8baa517791953a
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to external resources, indicating a link farm or redirection strategy. One critical heuristic firing confirms a PDF link to known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=inverses+of+3x3+matrices+worksheet', suggesting a lure related to mathematical worksheets. The presence of multiple unknown URLs further supports a malicious intent to redirect users to potentially harmful content.

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.com/pify?keyword=inverses+of+3x3+matrices+worksheet
    • http://fogatata.tickittyshake.com/uploads/1/3/0/8/130814687/69c822d03963a.pdf
    • http://files.peaknomads.co.uk/uploads/1/3/2/6/132681033/63fd229c8cd6.pdf
    • http://files.dongpu.studio/uploads/1/3/0/8/130873708/xitabelusimi.pdf
    • http://files.peterroach.net/uploads/1/3/1/8/131856374/b7703c309ba5750.pdf
    • https://cdn.shopify.com/s/files/1/0432/5978/9472/files/27378672032.pdf
    • https://cdn.shopify.com/s/files/1/0439/0567/9528/files/effective_communication_skills.pdf
    • https://cdn.shopify.com/s/files/1/0429/9181/2767/files/cancer_de_cuello_uterino_causas.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6976/files/mawetofubimirejugizapiwut.pdf
    • https://cdn.shopify.com/s/files/1/0432/3239/5426/files/fedukejeru.pdf
    • https://cdn.shopify.com/s/files/1/0440/7197/7110/files/ejercicios_aerbicos.pdf
    • https://cdn.shopify.com/s/files/1/0437/8345/4872/files/miriligelusalopikar.pdf
    • https://cdn.shopify.com/s/files/1/0440/7299/2918/files/acute_renal_failure_articles.pdf
    • https://cdn.shopify.com/s/files/1/0428/2646/5436/files/73199807327.pdf
    • https://cdn.shopify.com/s/files/1/0430/3863/8241/files/salodopemamu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0363/3051/files/categories_of_diseases.pdf
    • https://cdn.shopify.com/s/files/1/0433/0913/8075/files/57226519930.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000505f.bin
70935a0ee801b35fc6b46943b341ad6e4cc13b5181e62cac847f1e5d3c7cfa3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x505F 5476 bytes
font_01_sfnt_off000062ea.bin
cb21f1711322f61dee939293f3dc0ad7bb31300785710bd781265ae5958207af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62EA 10144 bytes
font_02_sfnt_off0000854a.bin
3210a33707ceda52ebe29b2623009cfb3b3d6b073d103cc6b07a85effab26d5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x854A 16060 bytes

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