Malicious PDF — malware analysis report

Static analysis result for SHA-256 269aedaae4b2be21…

MALICIOUS

PDF

38.9 KB Created: 2020-08-12 08:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f3b742d8a06756f7071eed3d16afe99 SHA-1: f3ba5907b96257721e445c20d529b7bb539285c6 SHA-256: 269aedaae4b2be21e9671089686a43ee0e63958fa3c9db1f17efcea36ae362c6
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a large number of embedded links, suggesting an SEO manipulation or link farm tactic. The primary malicious URL identified is https://ttraff.com/wb?keyword=one%20step%20equations%20with%20fractions%20worksheet%20answers. While no scripts were extracted, the sheer volume of links and the critical heuristic firings strongly suggest a malicious intent, likely to drive traffic to malicious infrastructure or to host further malicious 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/wb?keyword=one%20step%20equations%20with%20fractions%20worksheet%20answers
    • http://files.torontometabolicclinic.com/uploads/1/3/0/7/130738565/198c778.pdf
    • http://files.fwdistrict5.com/uploads/1/3/0/9/130969761/4003004.pdf
    • http://files.tamenne.org/uploads/1/3/2/8/132815123/buseguzujuzofibivuk.pdf
    • https://cdn.shopify.com/s/files/1/0445/1853/9423/files/personality_test_melancholy_phlegmatic_sanguine_choleric.pdf
    • https://cdn.shopify.com/s/files/1/0428/7932/0223/files/27191919022.pdf
    • https://cdn.shopify.com/s/files/1/0432/8272/7067/files/81834508916.pdf
    • https://cdn.shopify.com/s/files/1/0428/0185/6668/files/4208048035.pdf
    • https://cdn.shopify.com/s/files/1/0434/8303/7860/files/perasodewajidurenevuxewi.pdf
    • https://cdn.shopify.com/s/files/1/0451/3293/9429/files/envision_math_6th_grade_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1079/files/69121372127.pdf
    • https://cdn.shopify.com/s/files/1/0432/8397/2256/files/burakugu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8443/9971/files/adobe_hosts_file.pdf
    • https://cdn.shopify.com/s/files/1/0433/3246/8890/files/tarefiparekerebuxum.pdf
    • https://cdn.shopify.com/s/files/1/0435/3658/0759/files/pekijuxolorixoreladifemi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1961/5901/files/definition_of_visual_impairment.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_off00004cbb.bin
3b7687a3bc0e66f944084e641a2aa19f9e11db0f37230ed388ef437611a10179		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CBB 5260 bytes
font_01_sfnt_off00005eb0.bin
9ce80a385a661528aca4d6dd36aba216b28f31bb19e693a7eb7f3c57ef993890		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB0 9780 bytes
font_02_sfnt_off00008023.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8023 4324 bytes

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